Tube Tech CL 1B Opto Compressor - Manual (Page 7)

LYDKRAFT ApS
Mose Allé 20, DK 2610 Rødovre
Denmark
7
ADJUSTMENT OF THE VU METER READING "COMPRESSION":
1) Turn the THRESHOLD-control fully counter-clockwise.
2) Switch the METER-selector to Compression.
3) Set the RATIO-control at 2:1
4) Apply a signal of 1 kHz, 0,0 dBU into the input of the compressor.
5) Adjust the GAIN-control to an output-reading of 0,0 dBU.
6) Adjust P 4 (P 2)* until the meter is reading 0 VU.
7) Apply a DC-voltage of +250,0 mV into the side chain jack socket and observe that the
output level has dropped to -10,0 dBU. If this is not the case, adjust the compression
tracking (see above)
8 Adjust P 3 until the meter is reading -10,0 VU.
9) Remove the DC-voltage from the side chain jack socket.
10) Repeat step 6 - 9.
NB: The VU-meter accuracy should be within +/- 0,5 dB when reading compression.
ADJUSTMENT OF THE RELEASE CONTROL:
1) Set the METER switch in position compression.
2) Set the attack/release SELECT switch in position manual.
3) Apply a signal of 1 kHz, 0,0 dBU into the input of the compressor.
4) Adjust the THRESHOLD-control to a reading of -10 VU of the VU-meter
5) Set the ATTACK-control at fast.
6) Set the RELEASE-control at slow.
7) Switch off the 1 kHz and observe that the VU meter moves to 0 VU in approx. 10 sec.
8) If this is not the case, adjust P 1 (P 5)*, to obtain a release time of approximately 10 sec.
* The trimpots in parenthesis refers to PCB 870316-0,1,2
(
950119)