instrumentation or synchronous commentary
This commit is contained in:
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a9e5cace83
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@ -70,6 +70,10 @@ b) The AC-LINE-POWER-SUPPLY APS 8 (110 to 240 V, 50 or 60 Hz) which not only fur
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Set the voltage selector to the correct line voltage and connect to the SP 8 "EXTERNAL" receptacle by means of the cable, connect the APS 8 mains lead to the AC line (the red lamp should then glow). The taperecorder can now be operated in the usual manner, while the batteries are recharging, indicated by the white lamp. The power supply also delivers a 1,3 volt line signal for synchronization purposes (special cable needed). The fuse is 160 mA.
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#+BEGIN_export latex
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\clearpage
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#+END_export
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#+ATTR_LaTeX: :placement [!htb]
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#+ATTR_LATEX: :width 1.1\linewidth :align c
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#+caption: APS 0118
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@ -80,6 +84,11 @@ Set the voltage selector to the correct line voltage and connect to the SP 8 "EX
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#+caption: Voltage diagram in relation to the current of the APS 8
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[[file:img/3.voltage.png]]
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#+BEGIN_export latex
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\clearpage
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#+END_export
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* 4. Magnetic tapes and large reel adaptor kit "ABR"
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The quality of recordings obtained with the STELLAVOX recorders depends very much on the excellence of the microphones and magnetic tapes used. Therefore, only the highest quality tapes are recommended. It is well known that even among the best brands there are marked differences between the magnetic characteristics, requiring a specific bias and equalization in order to achieve optimum recording quality.
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@ -98,7 +107,7 @@ Bur, considering two main classes of the magnetic oxides of current tapes (“st
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** Instructions for Use of the Abr Large Reel Adaptor Kit
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Place the sp 8 taperecorder with its plastic lid open (or removed) on the admcor base plate until it rests against the locating pins (2). clamp it to the base plate using the fasteners (3). screw both reel holders (4) to their respective threaded studs on the base plate. add the intermediate pieses (code: ABR Q for the SQ 8 only). place the supply reel (6) and the takz-up reel (7) on the spindles and fasten using the knurled hold~-down pulieys (8) and (9). use the larger groove for 10 4" reels and the smaller groove for 7" reels (13). use the intermediate parts (code: ABN) for the nae netal reels having a large center hole.
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Place the sp 8 taperecorder with its plastic lid open (or removed) on the admcor base plate until it rests against the locating pins (2). clamp it to the base plate using the fasteners (3). screw both reel holders (4) to their respective threaded studs on the base plate. add the intermediate pieces (code: ABR Q for the SQ 8 only). place the supply reel (6) and the takz-up reel (7) on the spindles and fasten using the knurled hold~-down pulleys (8) and (9). use the larger groove for 10 4" reels and the smaller groove for 7" reels (13). use the intermediate parts (code: ABN) for the nae metal reels having a large center hole.
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Screw the two teflon guide pulleys (5) to the sp 8's reel spindles, tightening them firmly. thread the tape according to the tape path (12) and attach the two belts (10) and (11). remove the belt (11) whenever rewinding. remember to brake the right reel gently by hand when stopping the recorder from "rewlnd".
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@ -111,7 +120,7 @@ Reels up to 12" diameter (ø 30 cm) may be used with some care!
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TO REWIND REMOVE BELT (11)!
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#+ATTR_Latex: :Placement [!Htb]
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#+Caption: Abr Large Reel Adaptor
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#+Caption: ABR Large Reel Adaptor
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[[file:img/4.ABR.png]]
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#+BEGIN_export latex
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@ -212,7 +221,7 @@ IT IS A GOOD PRACTICE TO DEMAGNETIZE THE SHD REGULARLY.
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The recorders SP 8, SM 8 and SI 8 have two complete recording/playback channels (four in the SQ 8) and each such channel has three inputs:
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*"MIXER" input:*
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The mixer input is provided on the "AUX" receptacle on the lef-hand panel, at a fixed level of 1.55 V (+ 6 dBm), high impedance 680 K, which may be connected to any suitable source, the Stellavox mixer for instance. This input can be mixed with the mike and line inputs of the same channel in the STEREO selection, and all together in the MONO selection.
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The mixer input is provided on the "AUX" receptacle on the left-hand panel, at a fixed level of 1.55 V (+ 6 dBm), high impedance 680 K, which may be connected to any suitable source, the Stellavox mixer for instance. This input can be mixed with the mike and line inputs of the same channel in the STEREO selection, and all together in the MONO selection.
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*"LINE" input:*
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Located on the "AUX" receptacle this input is adjusted by a separate (small round knob on the front panel) volume control, within 30 mV to 10V.
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@ -266,18 +275,18 @@ The portable professional STELLAVOX mixer is connected to the "AUX" receptacle o
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Other sound sources (e.g. taperecorder, tuner, amplifier, etc.) can be connected to the "AUX" receptacle (2). Both channels are individually adjustable with both line volume controls ("LINE 1 + LINE 2"), (microphones with AMA or ALP 8).
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With the "stereo with synchrotone" version of the SP 8, a third track with its input and output labelled "pilot" is available at the
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"SYNCHRO" receptacle. Similarly for mono versions including the neo- pilotone sync. head.
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"SYNCHRO" receptacle. Similarly for mono versions including the neo-pilotone sync. head.
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*Playback* of a recorded tape (position "PLAY"')
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The outputs of the two channels can be taken off at the "OUTPUT" receptacle as described in section 8. Both channels are separated if switched to stereo selection and together with mono selection (DIRECT position of monitor switch only; level controlled by Ch l, Ch 2 gain controls).
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It is therefore quite easy to make a copy of a tape by connecting as follows: Prepare an interconnecting cable linking the "OUTPUT" of the playback machine with the "MIXER 1 and 2" pins of the "AUX" connector on the recording machine; in that way both outputs and inputs aré properly matched.
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It is therefore quite easy to make a copy of a tape by connecting as follows: Prepare an interconnecting cable linking the "OUTPUT" of the playback machine with the "MIXER 1 and 2" pins of the "AUX" connector on the recording machine; in that way both outputs and inputs are properly matched.
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* 10. Synchronizing
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Professionals using synchronizing are well informed about basic principles, therefore, we only give the explanations of the particularities and the possibilities offered by the SP 8 recorders.
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The mono tape headassembly (full track) 1s equipped with the conventiomal neo-pilot head. It is absolutely compatible with other similar sound equipment. The pilot signal of 1.2 to 1.8 volts, 50 or 60 liz, is injected into the “pilotTM input at the "SYNCHRO" receptacle. The presence and magnitude of the pilot signal is indicated with the small meter “pilot” located on the front panel. The first red zone corresponds to an insufficient signal, the green zone to a correct level. The pilot input impedance is high (several k-ohms) so that the resistance of the synchronizing cable from the camera wili have no effect. On playback the amplified signal from the pilot head is connected to the “pilot" pin of the "EXTERNAL" receptacle, but only if the module SX 023 or SXy 123 or SQS is plugged in the SP 8.
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The mono tape headassembly (full track) 1s equipped with the conventional neo-pilot head. It is absolutely compatible with other similar sound equipment. The pilot signal of 1.2 to 1.8 volts, 50 or 60 Hz, is injected into the “pilot input at the "SYNCHRO" receptacle. The presence and magnitude of the pilot signal is indicated with the small meter “pilot” located on the front panel. The first red zone corresponds to an insufficient signal, the green zone to a correct level. The pilot input impedance is high (several k-ohms) so that the resistance of the synchronizing cable from the camera will have no effect. On playback the amplified signal from the pilot head is connected to the “pilot" pin of the "EXTERNAL" receptacle, but only if the module SX 023 or SXy 123 or SQS is plugged in the SP 8.
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The stereophonic tape head assembly cannot be fitted with a neo-pilot head because there would be too much crosstalk on playback. Consequently a third track (0.4 mm.) has been provided in the center between the two stereo tracks (SYNCHROTONE ~ patented). Special precautions are taken, so that the crosstalk characteristics are better than those of classic neo-pilot system. An additional advantage is the feasibility of recording not only 50 or 60 Hz signals, but the complete audio spectrum. Impulse controls (e.g. slide projector: Code ASP), time base for instrumentation or synchronous commentary (a micro preamplifier APM is available) may be recorded.
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@ -346,9 +355,9 @@ Plugged inside the SP 8 in place of the SXQ gives the same functions plus the sy
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** 10.3 A Unit for Resolving Stellavox Neo-pilot or Synchrotone Using a Nagra SLO Synchronizer: ASO
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We provide a means of resolving tapes recorded with either neo-pilot or the exclusive STELLAVOX synchrotone (third track on stereo tapes) using methods standard in the industry up to now: namely Nagra + SLO. The result is an adaptor unit, code name ASO, which is connected between the "synchro" and “external” outlets of the recorder and both connectors on the right side of the Nagra SLO and which permits any tape at any speed recorded with either neo-pilot or synchrotone to be resolved according to conven- tional methods. The ASO unit comes complete with all cables and plugs ready to operate.
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We provide a means of resolving tapes recorded with either neo-pilot or the exclusive STELLAVOX synchrotone (third track on stereo tapes) using methods standard in the industry up to now: namely Nagra + SLO. The result is an adaptor unit, code name ASO, which is connected between the "synchro" and “external” outlets of the recorder and both connectors on the right side of the Nagra SLO and which permits any tape at any speed recorded with either neo-pilot or synchrotone to be resolved according to conventional methods. The ASO unit comes complete with all cables and plugs ready to operate.
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*IMPORTANT*: As great amplification is provided by the ASO circuits (to amplifiy the low played back voltage of the sync. head), a 2.2 ohm resistor must be soldered inside the ASO, parallel to the .01 nF capacitor at the rear of the printed card, if an SXQ 123 module is incorporated in the SP 8 (the SXQ provides already the amplification up to 1.3 volt). If no SXQ, the sync. head must be directly connected inside the SHD, to the pin "pilot" by simple resoldering.
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*IMPORTANT*: As great amplification is provided by the ASO circuits (to amplify the low played back voltage of the sync. head), a 2.2 ohm resistor must be soldered inside the ASO, parallel to the .01 nF capacitor at the rear of the printed card, if an SXQ 123 module is incorporated in the SP 8 (the SXQ provides already the amplification up to 1.3 volt). If no SXQ, the sync. head must be directly connected inside the SHD, to the pin "pilot" by simple resoldering.
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** 10.2.1 The Display of the Sync. Functions (SPECIAL DESIGN)
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(page 14a)
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@ -378,7 +387,7 @@ The two levers carrying the tape guide rollers and the pinch wheel are electrica
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NEVER ATTEMPT TO FORCE THE LEVERS OPEN BY HAND!
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In position "AUTOMATIC" (not available for the SQ 8 version) a new electronic device (module SGC) sets the recording level automatically to the correct value without distortion. The level relation between the two stereo channels is maintained, permitting the automatic recording of stereo music with high quality. The treshold of the automatic level control system is selectable by choosing the appropriate setting of the two volume controls for the source being recorded. This will depend both on the output level of the microphones used and on the sound level input to the microphones. Set the two potentiometers to a setting which in the "RECORD" position will yield approximately correct levels (turn the potentiometer which would not be in use fully counter clockwise).
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In position "AUTOMATIC" (not available for the SQ 8 version) a new electronic device (module SGC) sets the recording level automatically to the correct value without distortion. The level relation between the two stereo channels is maintained, permitting the automatic recording of stereo music with high quality. The threshold of the automatic level control system is selectable by choosing the appropriate setting of the two volume controls for the source being recorded. This will depend both on the output level of the microphones used and on the sound level input to the microphones. Set the two potentiometers to a setting which in the "RECORD" position will yield approximately correct levels (turn the potentiometer which would not be in use fully counter clockwise).
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All important functions can be controlled from the front panel, without need of opening the cover over the deck (even rewind). Record in position "AUTOMATIC" when for any reason the manual controls, left in their position, cannot be operated.
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@ -388,7 +397,7 @@ In front of the deck accessible after opening the cover:
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a) To the left are both selector switches, for dynamic microphones (D), phantom 12 V (P 12) or optional 48 V (P 48), and AB condenser microphones (T). Always turn the switch back to position (D) unless condenser microphones are used exclusively. Otherwise very delicate dynamic or ribbon microphones may be damaged. The equivalent selectors for mike 3 and mike 4 of the SQ 8 are placed on the bottom of the recorder
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b) To the right is the combined on/off volume control for the amplifier of the built-in loudspeaker. Please note that the speaker is operational in all these positions: "TEST/RECORD/AUTOMATIC/PLAY" and can, therefore, also be used for monitoring purposes during recording. In the latter application the speaker volume must be set low enough to avoid accoustical feedback (Larsen effect), if the microphones are close.
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b) To the right is the combined on/off volume control for the amplifier of the built-in loudspeaker. Please note that the speaker is operational in all these positions: "TEST/RECORD/AUTOMATIC/PLAY" and can, therefore, also be used for monitoring purposes during recording. In the latter application the speaker volume must be set low enough to avoid acoustic feedback (Larsen effect), if the microphones are close.
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c) To the right of the headassembly is a toggle switch which, in its momentary position to the right, puts the recorder in fast forward
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speed (not operative in the "RECORD" function). The same switch pushed to the left will inject a 1 kHz tone at reference level into channel I when the recorder has been equipped with the SXQ 023 (or SXQ 123 module, or with the SQS module). (The tone is recorded on channel I and II with the Mono/Stereo switch in Mono position,
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@ -401,7 +410,7 @@ f) On the right-hand panel there are the phone output stereo jack, monitored by
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*Editing facility*
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When the SP 8is in playback mode, the pressure roller may be disengaged by pulling it away from the capstan and pulling up on the button atop the pressure roller arm. The tape may now be shuttled by hand while listening on the speaker or phones. When the exact spot where a cut is to be made is located, rotate the iteft guide roller until one of the black dots just appears at the upper metal cover. Now slowly move the tape to the left until the next dot appears. At this time the spot to be cut is precisely under the black dot at the front of the SHD headassembly, permitting either a cut using scissors or marking with a grease pencil.
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When the SP 8is in playback mode, the pressure roller may be disengaged by pulling it away from the capstan and pulling up on the button atop the pressure roller arm. The tape may now be shuttled by hand while listening on the speaker or phones. When the exact spot where a cut is to be made is located, rotate the left guide roller until one of the black dots just appears at the upper metal cover. Now slowly move the tape to the left until the next dot appears. At this time the spot to be cut is precisely under the black dot at the front of the SHD headassembly, permitting either a cut using scissors or marking with a grease pencil.
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In that way the "mechanical" start-stop of the tape, for recording editing or playing-back may be done without the switching "clicks", the tape running instantly when the button is Pressed down in PLAY/ RECORD /AUTOMATIC.
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@ -413,7 +422,7 @@ In that way the "mechanical" start-stop of the tape, for recording editing or pl
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The various functions of the plug-in modules are clarified by referring to the block diagram but their understanding is not necessary for the correct use of your recorder. The modules are accessible after removing the bottom plate of the recorder, held in place with 6 screws. To open the SQ 8 quadrosonic recorder, do not attempt to remove the bottom plate or the hinge; simply unscrew both screws located in front, left and right of both center main frames which are tightened together with these screws, then hinge the SQ 8 open.
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Note that the audio electronicosf the SQ 8 are the double of those of the SP 8 recorder.
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Note that the audio electronics of the SQ 8 are the double of those of the SP 8 recorder.
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*IMPORTANT*: Note that SM 8 version uses a different bias frequency (128 kHz) from that used for the standard SP 8 line. Therefore, bias oscillator module SBC and filter module SIZ are different and cannot be interchanged.
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@ -429,7 +438,7 @@ The signal coming from the playback head is amplified by another preamplifier SP
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At this point the amplified and equalized signal, from the SPC PLAY, is fed to two circuits:
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a) either to the SOC record amplifier, so that the signal is controlled by the potentiometer, metered by the modulometer and fed to the "PHONE" jack and to the "OUTPUT" plug via the "DIRECT/TAPE" switch.
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b) or through a fixed divider equivalento the pot. zero dB ratio, to the SOC PLAY amplifier, which in turn feeds the “DIRECT/TAPE" switch.
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b) or through a fixed divider equivalent to the pot. zero dB ratio, to the SOC PLAY amplifier, which in turn feeds the “DIRECT/TAPE" switch.
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As a result: during recording meters and phones and outputs (but not the transformer outputs; always "DIRECT" optionally to the incoming ("DIRECT") back signal ("TAPE").
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@ -460,7 +469,7 @@ The tape head front surfaces should be cleaned from time to time with a soft clo
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The STELLAVOX recorders contain numerous precision ball bearings, lubricated for life and sealed against dust. All other bearings are self~lubricating for many years, using special oils in sintered metals. The felt brakes also have a very long life but can easily be replaced if it becomes necessary. The motor brushes are subjected to very little abrasion but can just as easily be replaced. Since they are working against a flat and not a cylindrical surface, preshaping is unnecessary.
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In short, the SP 8 should be treated like you would treat a professional camera; the batteries are to be removed when the recorder will not be
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used for several months. Check the tape heads regularly and never clean. them with a hard or metallic tool. Watch the correct polarity when inserting new batteries or conmecting an external power supply.
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used for several months. Check the tape heads regularly and never clean. them with a hard or metallic tool. Watch the correct polarity when inserting new batteries or connecting an external power supply.
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ALWAYS REMOVE THE BATTERIES BEFORE COMMENCING ANY WORK ON OR INSIDE THE SP 8, IN ORDER TO AVOID HARMFUL SHORT CIRCUITS:
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As a safety precaution, a 630 mA fuse is provided as well as a protection resistor of 5 ohms in the input line of the SVS. Use only same size replacements for the fuse.
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@ -493,7 +502,7 @@ The following accessories are available:
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*ABR* Large reel adaptor kit up to ¢ 12" (300 mm.).
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*ABN* ntermediate pieces for NAB metallic reels with large center hole.
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*ABN* Intermediate pieces for NAB metallic reels with large center hole.
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*ABR Q*. Large reel adaptor for SQ 8.
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@ -544,30 +553,22 @@ This machine is guaranteed for a period of one year from the date of sale accord
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It is very easy to make wonderful recordings, after some practical experience, by observing the following simple rules:
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- Clean and demagnetize regularly the sound heads.
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- Clean and regularly demagnetize the sound heads.
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- Use high quality tape, preferably the brand for which your taperecorder was adjusted.
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- Before recording, check carefully each part of the equipment, including cables and microphones.
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- Be sure of your batteries and always have a spare set of long life batteries for emergency.
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- Select the proper microphone and avoid extraneous noises by correct installation (elastic suspension). Choose the best location by listening carefully to the sounds to be recorded, at all possible installation points, before attempting to install.
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- Battery operation avoids possible noises sometimes encountered from line supply. This allows greater freedom in choosing the place where to install the recorder for best visibility and shortest cable (long cables may be used without difficulty, but might introduce line interference).
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- Close recording has greater presence, and improves the ratio of wanted sound/noise.
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- For long recording sessions use the ABR and large reels and have supplementary tape reels (including empty) ready, in order not to waste time rewinding.
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- Once a year and before very important recording sessions, check (or your nearest dealer could check it for you), eventually readjust, the main figures of your recorder, as azimuth of the heads, frequency response, distortion, S/N ratio, speed, wow + flutter. The universal instrument FERROGRAPH RTS 2 allows all these measurements.
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#+BEGIN_export latex
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@ -650,7 +651,7 @@ For any technical information please ask your dealer or contact us: STELLAVOX -
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14. Capstan
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15. Pinch wheel arm
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16. Pinch wheel
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17. Loudspesker volume~control
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17. Loudspeaker volume~control
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18. Tension roller, right
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19. Plug for varistor ASV
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20. Speed adjustment, access screw
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@ -672,7 +673,7 @@ For any technical information please ask your dealer or contact us: STELLAVOX -
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36. Mike input 1
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37. Tension roller left
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38. Shoulderstrap-shaft
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39. Modulometer protection iid
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39. Modulometer protection lid
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40. Stabilizing roller
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41. Att. selecting channel 1
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42. Mike selecting knob 1
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@ -684,11 +685,11 @@ For any technical information please ask your dealer or contact us: STELLAVOX -
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48. Pilot meter
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49. "Synchro" led
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50. Channel 2 line level control
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51. Channel 1 Line levei control
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51. Channel 1 Line level control
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52. Battery voltage switch
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53. Tape-Direct switch
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54. Modulometer light switch
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55. Channei 1 level control
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55. Channel 1 level control
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56. Channel 2 level control
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57. Fast forward and "Beep" switch
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58. Body frame, superior
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Binary file not shown.
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@ -31,11 +31,11 @@ Telex : 35380
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ref.: 827
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All care is given to ensure that the information provided in this booklet is accurate and up-to-date.
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Nevertheless progressive improvemenmtasy be incorporated in this equipment from time to time and this may lead sometimes to inaccuracies or inconsistencies in this publication.
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Nevertheless progressive improvements may be incorporated in this equipment from time to time and this may lead sometimes to inaccuracies or inconsistencies in this publication.
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We therefore suggest the cooperation of users in reporting such possible errors or omissions or even suggesting improvements.
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For servicing, informations and spare parts, please contact
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For servicing, information and spare parts, please contact
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STELLAVOX
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Jardillets 18
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@ -136,7 +136,6 @@ IMPORTANT : please always quote equipment type and serial number when requesting
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List No. 2b
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#+BEGIN_export latex
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\clearpage
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#+END_export
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@ -173,15 +172,15 @@ After concluding the mechanical work the SHD should always be demagnetised.
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To disassemble the motor, the pinch wheel lever must be removed. Unscrew lateral and top screws of that lever and remove it by pulling gently. Open the path as described in 2.2 and disconnect the equipment from any supply.
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Remove the bottom plate and the drive-belts. Pull out the motor connector and its ground attachement.
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Remove the bottom plate and the drive-belts. Pull out the motor connector and its ground attachment.
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Lie the equipment in front of you on a flat surface, held the motor firmly underneath with the left hand, unscrew the fastening screws on top with the key, put the equipment on edge, thereby holding the loose motor at an angle and raise the steel cable of the tensiometer over the gear of the mechanism. The motor can then be pulled out carefully.
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To rebuild the laid out mechanism in its correct position, turn the motorpulley to the left. Hold the equipment at an angle, adjust the motor until the bracket of the mechanism arm interlocks into the counter-rotation arm still in the equipment. Thus with the left hand move the rotation arm until the interlock can be felt. Raise the cable of the tensiometer again over the gear and fasten the motor with the three inbus screws. Before the screws are tightened finally, test the mechanics.
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To rebuild the laid out mechanism in its correct position, turn the motor pulley to the left. Hold the equipment at an angle, adjust the motor until the bracket of the mechanism arm interlocks into the counter-rotation arm still in the equipment. Thus with the left hand move the rotation arm until the interlock can be felt. Raise the cable of the tensiometer again over the gear and fasten the motor with the three inbus screws. Before the screws are tightened finally, test the mechanics.
|
||||
|
||||
For adjustment of the pinch wheel lever turn manually to the right the motor-pulley until the left roller arm pressed against it is in the working position "PLAY". Release the pinch roller (pull out button on the arm) and position roller arm at 0,2 mm distance from the capstan. Tighten both imbus screws of the arm. Press button, the counter-capstan roller is released and lies between 450-550 grams pressure against capstan.
|
||||
|
||||
After every dismantling and re-buildinogf the motorblock, the tape tension rollers are set as described under [[3.4]].
|
||||
After every dismantling and re-building of the motorblock, the tape tension rollers are set as described under [[3.4]].
|
||||
|
||||
** 2.4 Wind-off Side
|
||||
|
||||
|
|
@ -193,7 +192,7 @@ Watch out for the position and direction of the steel cord. Further assembly in
|
|||
|
||||
** 2.5 Wind-up Side
|
||||
|
||||
This winding assembly is in principale mounted like the wind off side. To disassemble, one unscrews the top side existing three imbus screws and at the same time with the left hand hold the winding section firmly, put the equipment on edge and pull it out.
|
||||
This winding assembly is in principle mounted like the wind off side. To disassemble, one unscrews the top side existing three imbus screws and at the same time with the left hand hold the winding section firmly, put the equipment on edge and pull it out.
|
||||
|
||||
The tensiometer cable is thereby lose and must re~assembly be first lead over the cable roller mounted in a rocker arm. The roller should at first point towards the loudspeaker. After that pull the cable over the second roller and the brass leaf spring and bring the winding section with a slight right turn into position and fasten.
|
||||
|
||||
|
|
@ -238,14 +237,14 @@ Remove all buttons: CH-1, CH-2, main switch, LINE-1, LINE-2, meter selector, und
|
|||
|
||||
** 2.11 Potentiometer CH-1, CH-2
|
||||
|
||||
Remove the front panel as described in [[2.10]]. The furter fastening of the potentiometer is visible. Unsolder connection wires and pull out potentiometer inwards. The installation is easier if the motor is taken out previously.
|
||||
Remove the front panel as described in [[2.10]]. The further fastening of the potentiometer is visible. Unsolder connection wires and pull out potentiometer inwards. The installation is easier if the motor is taken out previously.
|
||||
|
||||
** 2.12 Potentiometer LINE-1, LINE-2, SJK-Module
|
||||
<<2.12>>
|
||||
|
||||
To change the line potentiometer, the SJK module must be disassembled. Remove buttons on the pre-attenuation switches, modulometer and its lighting. The SJK module is fastened inside screws and under the modulometeer with two further sunk headed screws.
|
||||
To change the line potentiometer, the SJK module must be disassembled. Remove buttons on the pre-attenuation switches, modulometer and its lighting. The SJK module is fastened inside screws and under the modulometer with two further sunk headed screws.
|
||||
|
||||
The two line potentiometers are mounted with central fastening on a U-form metal component. This metal component is fastened at the front with two sunk headed screws. Unsolder connections of the potentiometers before thei removal. Assembly in reverse order.
|
||||
The two line potentiometers are mounted with central fastening on a U-form metal component. This metal component is fastened at the front with two sunk headed screws. Unsolder connections of the potentiometers before their removal. Assembly in reverse order.
|
||||
|
||||
** 2.13 Potentiometer "PHONE"
|
||||
|
||||
|
|
@ -270,7 +269,7 @@ Remove bottom cover, pull out side modules SPC+SOC. The switch is soldered on a
|
|||
|
||||
** 2.18 Switch "METER"
|
||||
|
||||
Remove the bottom plate and the front panel as described under [[2.10]]. Dismantle the SJK module as described under [[2.12][2.12]]. Undo holderpiece for switch and indicator at the front. Unscrew potentiometer support and remove holder depart with indicator forwards. The switch is now freely accessible. Assemble in reverse order.
|
||||
Remove the bottom plate and the front panel as described under [[2.10]]. Dismantle the SJK module as described under [[2.12][2.12]]. Undo holder-piece for switch and indicator at the front. Unscrew potentiometer support and remove holder depart with indicator forwards. The switch is now freely accessible. Assemble in reverse order.
|
||||
|
||||
** 2.19 Switch "Speed"
|
||||
|
||||
|
|
@ -303,7 +302,7 @@ Remove bottom cover and take off plug module SQS (SXQ) and SIZ. Dismantle wind o
|
|||
|
||||
** 2.26 Modules
|
||||
|
||||
The modules are for most part plug units exchangeable in the described way. Some possess an additional groundwire which has to be unsoldered. The changing of the SJK-module is described under 2.12, and that of the output carry over set SOT under [[2.25]].
|
||||
The modules are for most part plug units exchangeable in the described way. Some possess an additional ground-wire which has to be unsoldered. The changing of the SJK-module is described under 2.12, and that of the output carry over set SOT under [[2.25]].
|
||||
|
||||
#+BEGIN_export latex
|
||||
\clearpage
|
||||
|
|
@ -312,7 +311,7 @@ The modules are for most part plug units exchangeable in the described way. Some
|
|||
* Mechanical Adjustments
|
||||
** 3.1 Headsblock SHD
|
||||
|
||||
Every sound head carrier is equipped with 3 or 4 heads for erase, record, pilot and play-black. The individual heads, in a cutaway mounting, are ad justable from the opened SHD with 4 thread screws. Two screws in the shaft form the edge, with which at the same time head height and zenit is adjusted. Two further screws sideways from the slit serve the adjustment of the azimut and the fixing of the heads.
|
||||
Every sound head carrier is equipped with 3 or 4 heads for erase, record, pilot and play-black. The individual heads, in a cutaway mounting, are adjustable from the opened SHD with 4 thread screws. Two screws in the shaft form the edge, with which at the same time head height and zenit is adjusted. Two further screws sideways from the slit serve the adjustment of the azimut and the fixing of the heads.
|
||||
|
||||
[[file:img/3.1.headsblock-SHD.png]]
|
||||
|
||||
|
|
@ -326,7 +325,7 @@ The following work described requires a trained technician. The following specia
|
|||
|
||||
Put sound head carrier on the flat plate and test whether base is absolutely even. Remove carefully possible impurities or rub down evenly with a flat plate covered with a very fine emery paper.
|
||||
|
||||
With adjustment gauge, test the Height, Zenit and Azimut of the heads: if necessary adjust. Use magnifyinig glass and repeat the foregoing adjustments until the necessary accuracy is achieved,
|
||||
With adjustment gauge, test the Height, Zenit and Azimut of the heads: if necessary adjust. Use magnifying glass and repeat the foregoing adjustments until the necessary accuracy is achieved,
|
||||
|
||||
Fix the SHD with heads up and even up the surface of all heads with diamond paste 16 and polish with the diamond paste 8.
|
||||
|
||||
|
|
@ -358,7 +357,7 @@ By toothed brass disk on the left stroke, must engage the Delrin-gear on its ret
|
|||
|
||||
The brake action of the completed winding assemblies may be tested for the average coil diameter with a spring balance.
|
||||
|
||||
Put on a 1.5 m magnetic tape on a spool with 60 mm diameter, suspend tape beginning in a spring balance and at the same time draw out the tape in one movement. The measured value for the unwindling assembly must amount to 150 g, and for the winding up assembly 60 g. Tolerance +/- 25%.
|
||||
Put on a 1.5 m magnetic tape on a spool with 60 mm diameter, suspend tape beginning in a spring balance and at the same time draw out the tape in one movement. The measured value for the unwinding assembly must amount to 150 g, and for the winding up assembly 60 g. Tolerance +/- 25%.
|
||||
|
||||
By varying amounts the block brakes of the unwinding assembly can be covered with a new, self-adhesive piece of felt. For the winding up assembly side round pieces of felt are also obtainable as spare parts.
|
||||
|
||||
|
|
@ -377,12 +376,12 @@ First adjust the take-up side. Divide tape of 13 cm diameter spools equally on b
|
|||
|
||||
On the rewind side the adjustment is correct when the slit is symmetrically covered by the left tape tension roller.
|
||||
|
||||
*IMPORTANT*: Both drums are secured with two screws which should be lightly unscrewed before adjusting the drums. Retighten these screws after the adjustment. With these adjustment a constant tape tension of about 40 ~ 55 g is automatically guaranteed.
|
||||
*IMPORTANT*: Both drums are secured with two screws which should be lightly unscrewed before adjusting the drums. Re-tighten these screws after the adjustment. With these adjustment a constant tape tension of about 40 ~ 55 g is automatically guaranteed.
|
||||
|
||||
** 3.5 Steering Roller
|
||||
<<3.5>>
|
||||
|
||||
The sligthly convex turned roller provides with its ball bearing for accurate tape running and flutter damping. It is changeable after loosening the imbus screw on the top of the_roller. For correct positioning of the roller lever, fix it in opened position with 30 mm distance to the deck plate edge.
|
||||
The slightly convex turned roller provides with its ball bearing for accurate tape running and flutter damping. It is changeable after loosening the imbus screw on the top of the_roller. For correct positioning of the roller lever, fix it in opened position with 30 mm distance to the deck plate edge.
|
||||
|
||||
[[file:img/3.5.steering-roller.png]]
|
||||
|
||||
|
|
@ -406,7 +405,7 @@ All ball bearings are oiled once for their life and require no further maintenan
|
|||
|
||||
The upper capstan bearing can be occasionally oiled afterwards, solely with fine machine oil.
|
||||
|
||||
Should the brass leaf spring on the take-up assembly be changed, oil the surface betweeen steel cable and spring with resin free oil.
|
||||
Should the brass leaf spring on the take-up assembly be changed, oil the surface between steel cable and spring with resin free oil.
|
||||
|
||||
#+BEGIN_export latex
|
||||
\clearpage
|
||||
|
|
@ -415,15 +414,15 @@ Should the brass leaf spring on the take-up assembly be changed, oil the surface
|
|||
* Circuits of the Drive Assembly
|
||||
** 4.1 General
|
||||
|
||||
The driving force of the STELLAVOX-magnetic tape recorder SP 8 is a Stellavox servo-regulated direct current motor. The use of Samarium-cobalt for the stator as well as the special patented flat rotor are responsible for the high efficieny of the motor.
|
||||
The driving force of the STELLAVOX-magnetic tape recorder SP 8 is a Stellavox servo-regulated direct current motor. The use of Samarium-cobalt for the stator as well as the special patented flat rotor are responsible for the high efficiency of the motor.
|
||||
|
||||
The disc Shaped armature carries an axial commutator and a tacho-dise on its perimeter produces 400 bright-dark sectors, for the opto-electronic control range.
|
||||
The disc Shaped armature carries an axial commutator and a tachodise on its perimeter produces 400 bright-dark sectors, for the opto-electronic control range.
|
||||
|
||||
The current is supplied over 6 brushes.
|
||||
|
||||
For the stabilised forward running on record and play-back (without synchroniser operation) the following modules and circtiits operate: Voltage stabiliser SSC + 8V, circuit 140, tacho-module STF, circuit speed selector for SSP, motor drive module SMU and the motor SMC.
|
||||
For the stabilised forward running on record and play-back (without synchroniser operation) the following modules and circuits operate: Voltage stabiliser SSC + 8V, circuit 140, tacho-module STF, circuit speed selector for SSP, motor drive module SMU and the motor SMC.
|
||||
|
||||
In the function PLAYBACK synchroniser operation is possible with the internal module SQS or an external instrument. This has aditional effect on the operating point of the motor driving module SMU.
|
||||
In the function PLAYBACK synchroniser operation is possible with the internal module SQS or an external instrument. This has additional effect on the operating point of the motor driving module SMU.
|
||||
|
||||
To rewind the tape, the motor receives the maximum battery (or from power supply (voltage with reversed polarity and unregulated over the operation switch. For details see drawing [[No. 64.03.0016.1.5]].
|
||||
|
||||
|
|
@ -487,17 +486,17 @@ The 4-step rotary switch controls the tape speeds 9.5/19/38 cm/s by matched capa
|
|||
|
||||
The motor SMU module has a small opening, through which the variable ferrite core of a spool is accessible.
|
||||
|
||||
For the fine adjustment of the speed unscrew the concealed screw on the righ side panel, Through the opening one can vary the ferrite core, with a small screwdriver,
|
||||
For the fine adjustment of the speed unscrew the concealed screw on the right side panel, Through the opening one can vary the ferrite core, with a small screwdriver,
|
||||
|
||||
The fine speed adjustment is effected on running tape by checking the stroboscope disk of the tape tension roller. The strob. disk must be illuminated with fluorescent light.
|
||||
The fine speed adjustment is effected on running tape by checking the stroboscope disk of the tape tension roller. The strobe disk must be illuminated with fluorescent light.
|
||||
|
||||
** 5.3 Brushes
|
||||
|
||||
The motor is provided with a 6-part brush holder, which picks up 3 pairs of commutator brushes. For running two opposite brushes are necessary. The three pairs increase the reliability.
|
||||
|
||||
Switch off batteries or power supplies and remove the base cover. Take off belts and take out insulation disc fastened with three screws on the brush holder. Unsolder brushes - wires and take off insulation mantle. Lift the spring pressed against it with tweezers and pull the brushes out of the holder. Care must be taker, that the wire to the brushes leads through under the spring without mechanival strain, Thereby a reaction on the brush mounting and a noise free running of the motor will be guaranteed.
|
||||
Switch off batteries or power supplies and remove the base cover. Take off belts and take out insulation disc fastened with three screws on the brush holder. Unsolder brushes - wires and take off insulation mantle. Lift the spring pressed against it with tweezers and pull the brushes out of the holder. Care must be taker, that the wire to the brushes leads through under the spring without mechanical strain, Thereby a reaction on the brush mounting and a noise free running of the motor will be guaranteed.
|
||||
|
||||
One of the three pairs of trushes is made of some dark material for better compatibility between the metal of the commutator and the remaining brushes. These brushes are identified by a coloured point on the brush-holder.
|
||||
One of the three pairs of brushes is made of some dark material for better compatibility between the metal of the commutator and the remaining brushes. These brushes are identified by a coloured point on the brush-holder.
|
||||
|
||||
See also Stellinform 7807.10/T of 14.7.1978.
|
||||
|
||||
|
|
@ -577,7 +576,7 @@ See circuit [[No. 64.03.0018.1.5][No. 64.03.0018.1.5]]
|
|||
|
||||
** 6.6 Automatic: Drawing No. 64.03.0018.1.5
|
||||
|
||||
Possible internal rewiring of the STELLAVOX SP 8 results in two various operations at the AUTOMATIC: 1. manual adjustment of a higher gauge threshol: with the potentiometers CH-1 and CH-2: at higher levels, the SGC-module acts on the feedback of the SPC-amplifiers. 2. the manual adjustment of the channel potentiometer will be replaced by a fixed resistor which corresponds to the value of the work setting of the potentiometer.
|
||||
Possible internal rewiring of the STELLAVOX SP 8 results in two various operations at the AUTOMATIC: 1. manual adjustment of a higher gauge threshold with the potentiometers CH-1 and CH-2: at higher levels, the SGC-module acts on the feedback of the SPC-amplifiers. 2. the manual adjustment of the channel potentiometer will be replaced by a fixed resistor which corresponds to the value of the work setting of the potentiometer.
|
||||
|
||||
Description 2: detection over. 1000 pF, R 56 kOhm, SGC module Point 2 (in 1) SPC + SOC module Point 4 (out 1), S 1 IX (6), Pot. 10 kOhm R 6,8 kOhm 6,8 pF, Point 6 (in 2). Feedback: SPC-+ SOC Point 4, SGC Point 6, Point 7, SPC + SOC Point 3 (FB 1).
|
||||
|
||||
|
|
@ -725,7 +724,7 @@ An increase in the capacity value causes a decrease in voltage. The oscillator f
|
|||
|
||||
** 7.5 Playback Setting
|
||||
|
||||
Demagnetise sound headsblock and capstan. Put on reference tape according to selected speed. Connect LF-millivoltmeter and oscilloscope with the outputs of the equipment: "OUTPUT DIRECT 1" = Point 2 and Point 3 or “OUTPUT DIRECT 2" = Point 4 and Point 3 of the output socket. Put switch "TAPE/ DIRECT" in position "TAPE". For two speeds headsblocks, the above should be repeated.
|
||||
Demagnetise sound headsblock and capstan. Put on reference tape according to selected speed. Connect LF-millivoltmeter and oscilloscope with the outputs of the equipment: "OUTPUT DIRECT 1" = Point 2 and Point 3 or “OUTPUT DIRECT 2" = Point 4 and Point 3 of the output socket. Put switch "TAPE/ DIRECT" in position "TAPE". For two speeds headblocks, the above should be repeated.
|
||||
|
||||
[[file:img/7.5.playback-setting.png]]
|
||||
|
||||
|
|
@ -755,7 +754,7 @@ Connect equipment as 7.5 and sound generator with inputs of the equipment: "AUX
|
|||
|
||||
** 7.11 Oscillator Frequency
|
||||
|
||||
Connect digital counter (high input impedance!) on Point 15 of the headsblock. Put on erased tape and switch equipment on "RECORD". Set with C4 oscillator frequency on f = 61.44 kHz. Ajdust voltage with valve meter (high input impedance!).
|
||||
Connect digital counter (high input impedance!) on Point 15 of the headsblock. Put on erased tape and switch equipment on "RECORD". Set with C4 oscillator frequency on f = 61.44 kHz. Adjust voltage with valve meter (high input impedance!).
|
||||
|
||||
[[file:img/7.11.oscillator-frequency.png]]
|
||||
|
||||
|
|
@ -828,7 +827,7 @@ Connect LF-voltmeter and oscilloscope as in [[7.4]]. Set with R5 ([[No. 00.0006
|
|||
|
||||
** 7.23 Control of the Pilot Track Position
|
||||
|
||||
Set sound generator on measuring level 1.55 V and 50 Hz and record approx. 10 seconds of pilot signal. Wind back and play to read the pilot signal; then, *without rewinding,* reverse both reels in order to play the tape in reverse direction: there is a small difference between both signals, the second being lower if the pilot track is not centered. If this difference is higher than 1 dB, recalibrate properly the pilot head height.
|
||||
Set sound generator on measuring level 1.55 V and 50 Hz and record approx. 10 seconds of pilot signal. Wind back and play to read the pilot signal; then, *without rewinding,* reverse both reels in order to play the tape in reverse direction: there is a small difference between both signals, the second being lower if the pilot track is not centered. If this difference is higher than 1 dB, re-calibrate properly the pilot head height.
|
||||
|
||||
** 7.24 Synchrotone
|
||||
|
||||
|
|
@ -899,7 +898,7 @@ Should no flutter meter be available, but however a counter, appropriate instruc
|
|||
|
||||
- 6. By use of the signal 3150 Hz, the frequency of the Beep (approx. 1000 Hz) will be recorded.
|
||||
- 8. Playback of this 1000 Hz signal.
|
||||
- 10. Setting of the speeed with the trimmer (6) so that by changing ‘SYNC ON" to "OSC" and reverse the meter shows the same frequency.
|
||||
- 10. Setting of the speed with the trimmer (6) so that by changing ‘SYNC ON" to "OSC" and reverse the meter shows the same frequency.
|
||||
|
||||
#+BEGIN_export latex
|
||||
\clearpage
|
||||
|
|
@ -951,7 +950,7 @@ Should no flutter meter be available, but however a counter, appropriate instruc
|
|||
** Current Diagram "PILOT" - No. 64.03.0017.1.5
|
||||
<<No. 64.03.0017.1.5>>
|
||||
|
||||
#+caption: SP8 Pilot cuircuit - No. 64.03.0017.1.5
|
||||
#+caption: SP8 Pilot circuit - No. 64.03.0017.1.5
|
||||
[[file:img/No.64.03.0017.1.5.jpeg]]
|
||||
|
||||
#+BEGIN_export latex
|
||||
|
|
|
|||
Binary file not shown.
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Reference in a new issue