Studer A810 VU 2 Tracks Stereo Recorder User Guide
- June 13, 2024
- STUDER
Table of Contents
Studer A810 VU 2 Tracks Stereo Recorder User Guide
Layout of the internal cards
Tension gauges
- print on A4 paper and dimensions should be correct.
- check with the measurements in the drawing
- cut out the black beany shaped section
- install into A810 using the red screw points
- see the service manual section 3.4 for adjustment instructions
Calibration instructions
Studer A810 Calibration Quick Reference
The complete instructions are in the Service Manual section 4.2
important definitions
reference level = (magnetic) TAPE level
operating level = voltage level on the INPUT/OUTPUT
185, 250, 320, … nWb/m
studio: +4 dBu = 1,228 V = 0 VU aka linelevel
a tape recorded with reference level should produce operating level in the output in play mode (!)
the procedure
The calibrating steps should always be performed in the following order, and each section repeated for ch. 2.
1 GENERAL PREPARATORY STEPS: 4.2.1.6
Clean the tape path. Set all switches on the PERIPHERY CONTROLLER to the
correct setting 4.2.9.2
check the output level
- feed ch. 1 line input with 1kHz @ operating level
- connect mV-meter line to the output of ch. 1 and load with 600Ω
- press INP and release UNCAL
- adjust ouput level to operating level with the line amplifier trimmer accessible from the front.
check the VU-meter
- VU indication: Operating level should result in a reading of 0 VU
- PPM indication: Operating level should result in a reading of -6 (0 for reference level).
- correct the VU-meter reading with the trimmer potentiometer located on the back of the VU-meter amplifier.
2 REPRODUCE ADJUSTMENTS : 4.2.2
set code switch 8 on: JS 8 = 1 to enable programming
preparatory steps 4.2.2.1
- set tape type, equalization and tape speed as desired
- connect mV-meter line to the output of ch. 1 and load with 600Ω
- press SAFE and REP, release UNCAL
- spool reference tape to ‘reference level’ section (0 dB)
reproduce level adjustment 4.2.2.2
- press CH 1 and LEVEL REPRO
- start recorder in PLAY
- read out reproduce level on the mV-meter
- adjust to desired line level by pressing UP or DOWN and press STORE
azimuth alignment of the reproduce head 4.2.2.3
- spool reference tape to ‘azimuth alignment section’ (-10 dB)
- always adjust to maximum level first and then to minimum phase difference! See SM
- rewind tape to ‘reference level section’, check level and repeat reproduce level adjustment if necessary!
frequency response adjustment 4.2.2.4
-
spool to ‘frequency section’ of the tape (-20 dB)
-
select the corresponding tone:
16 kHz@30 ips, 14 kHz@15 ips, 12.5 kHz@7.5 ips, 8 kHz@3.75 IPS, all at -20 dB -
press CH 1 and TREBLE REPRO
-
start the recorder in PLAY mode
-
adjust to optimum frequency response by pressing UP or DOWN and press STORE
-
rewind calibration tape to the 63 Hz tone (-20 dB)
-
press CH 1 and BASS REPRO
-
start the recorder in PLAY mode
-
adjust for optimum frequency response by pressing UP or DOWN and press STORE
3 RECORDING ADJUSTMENT : 4.2.3
tape speed 7.5 or 15 ips (or preferred studio speed). Use new (or practically new) unrecorded tape
preparatory steps 4.2.3.1
- connect 1 kHz at line level to input and mV-meter to output
- press READY and REP, release UNCAL
record level adjustment 4.2.3.2
- press CH1 and LEVEL RECORD on input keyboard
- put recorder in record mode (PvdM addition)
- read output level on mV-meter and press UP or DOWN key for adjusting to line level.
- press STORE
azimuth alignment of the record head 4.2.3.3
- set generator to 10 kHz and decrease level by 20 dB. Connect millivoltmeter to line output channel
- start machine in RECORD mode
- correct azimuth by turning screw. If severe adjustment was necessary, repeat preparatory steps
bias adjustment 4.2.3.4
- set generator to 10 kHz and level to 20 dB below line level. Connect millivoltmeter to line output
- press CH 1 and BIAS on input keyboard
- start machine in RECORD mode
- press DOWN until MIN light flashes
- search maximum output voltage with UP and write down this value
- continue with UP key until delta dB is reached. See table at page 4/56 (pg. 187 PDF). Press STORE
record level adjustments 4.2.3.6
- set generator to 1 kHz and operating level. Connect millivoltmeter to line output.
- press CH1 and LEVEL RECORD on input keyboard
- start machine in RECORD mode
- adjust to line level by pressing UP or DOWN and press STORE
frequency response adjustment 4.2.3.7
- set generator to line level -20 dB. Connect mV-meter to line output
- press CH1 and TREBLE RECORD on input keyboard
- start machine in RECORD mode
- adjust to optimum frequency response (upward of 1 kHz) by pressing UP or DOWN. Press STORE
- press BASS REPRO (PvdM verified)
- adjust to optimum frequency response (up to 1 kHz) by pressing UP or DOWN. Press STORE
Cross-talk adjustment 4.2.3.8 (!)
4 SYNC REPRODUCTION ADJUSTMENT 4.2.4
not supported for 3.75 IPS; all parameters should be left at 00
preparatory steps 4.2.4.1
- Set jumper on REPRODUCE AMPLIFIER to narrow or wide, see 4.2.9.4
- connect mV-meter to line output
- select tape speed, tape type, and equalization
- press SAFE and SYNC buttons, release all UNCAL buttons
- mount calibration tape to REFERENCE LEVEL section. (0 dB)
sync reproduce level adjustment 4.2.4.2
- press CH1 and LEVEL REPRO on input keyboard
- start recorder in PLAY mode
- read out sync reproduce level and adjust to the desired line level (UP, DOWN) and press STORE
frequency response adjustments 4.2.4.3
- spool reference tape to the frequency responce section (-10dB) not correct (PvdM) ←
- press CH1 and TREBLE REPRO
- start recorder in PLAY mode
- play tone – 7.5 IPS: 8kHz, 15 IPS & 30 IPS: 12.5 kHz
- adjust for optimum frequency response by pressing UP or DOWN. Press STORE
- rewind reference tape to 63 Hz tone (-10 dB) again not correct (PvdM) ←
- press BASS REPRO (PvdM verified)
- start recorder in PLAY mode
- adjust to optimum frequency response by pressing UP or DOWN. Press STORE
Eprom Firmware Versions
FIRMWARE.
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You can find the firmware at https://www.reeltoreel.nl/studer/
KEYS:
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