Description
This 3U VU unit is suitable to any Studer Reel to Reel machine – or any other recorder – which comes without VU meters to enable control and monitor of recording and playback levels. Ensures calibrated and un-calibrated level control modes of recording and playback. VU meters can be switched between normal and “peak” modes with a simple push of a switch. In “peak” ballistics of VU meters are adjusted to show peak values of recording/playback.
The VU meter indicator circuitry is a modified replica of the Studer A810 (also A812, A816) including a switchable standard VU meter mode and a peak program meter (PPM) mode. In addition, there is a switch to increase the sensitivity by 10dB. -10 VU mode is also useful when calibrating the recorder with a test tape where tones are recorded at a level of -10 dB below nominal and you do not have external audio frequency VU meter.
Unit’s “0” value for VU meters is calibrated to “normal” Studer (studio standard) level – +4dB. “0” level can be adjusted to other values – if you want so.
All parts are top quality, schematics used are from top manufacturers. Operational Amplifiers are exchangeable – mounted in sockets. We use Texas Instruments INA137PA, DRV134PA.
In the input and output sections are additional RCA sockets. You can connect signal source which does not have XLR sockets.
| Specifications | |
| Analogue inputs (unbalanced) | RCA pin jacks |
| Nominal input level | -10 dBV (0.316 Vrms) |
| Maximum input level | +10 dBV (3.16 Vrms) |
| Input impedance | > 50 kOhm |
| Analogue inputs (balanced) | XLR-3 (1: GND, 2: HOT, 3:COLD) |
| Nominal input level | +4 dBu (1.23 Vrms) |
| Maximum input level | +24 dBu (12.3 Vrms) |
| Differencial input impedance | 24 kOhm |
| Analogue outputs (unbalaced) | RCA pin jacks |
| Nominal output level | -2 dBu (0.615 Vrms) |
| Maximum output level | +18 dBu (6.15 Vrms) |
| Output impedance | 100 Ohm |
| Analogue outputs (balanced) | XLR-3 (1: GND, 2: HOT, 3:COLD) |
| Nominal output level | +4 dBu (1.23 vrms) |
| Maximum output level | +24 dBu (12.3 Vrms) |
| Output impedance | 200 Ohm |
| Audio performance | |
| Frequency response | 10 Hz – 50 kHz, ±0.1 dB |
| Distortion (THD) | 0.0007 % or less |
| Distortion Plus Noise (THD + N) | 0.003 % or less |
| Power suply and other specifications | |
| Mains power | AC 100–240 V, 50-60 Hz |
| Power consumption | 10 W |
| Dimension (W x H x D) | 440 mm x 132 mm x 130 mm |
| Weight | 2.7 kg |
Internal block diagram
Connection example
Measurements
Tascam UH-7000 LOOP
CAL INP
CAL REP
UNCAL INP
UNCAL REP
UNCAL REP
STUDER A80-R
– Set the RCA / XLR switch to XLR.
– Set the Peak / VU switch to VU.
– Deactivate the RECORD LEVEL-UNCAL (Front panel) switch.
– Switch on the INP (Front panel) switch.
– Set switch 0 VU / -10 VU to 0 VU.
– +4 dBu (1,223 Vrms) signal at XLR input INPUT.
– Use potentiometer 0 on the back of the VU to set the VU meter reading to 0.
– Carry out the adjustment for channel CH1 and CH2.
– Set the switch to 0 VU / – 10 VU to -10 VU.
– At -6 dBu (0.388 Vrms) signal to XLR input INPUT.
– Use potentiometer -10 on the back of the VU to set the VU meter reading to 0.
– Carry out the adjustment for channel CH1 and CH2.
– Remove the cover by unscrewing the six screws (there is a washer under the upper left screw, please do not lose it).
– Set the RCA / XLR switch to RCA.
– Set the Peak / VU switch to VU.
– Deactivate the RECORD LEVEL-UNCAL (Front panel) switch.
– Switch on the INP (Front panel) switch.
– Set switch 0 VU / -10 VU to 0 VU.
– Supply a signal of -10 dBV (0.316 Vrms) to the RCA input INPUT.
– Use the potentiometer inside the unit to set the VU meter reading to 0.
– Carry out the adjustment for channel CH1 (L) and CH2 (R).
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