Tube Tech CL 1B Opto Compressor - Manual (Page 6)

LYDKRAFT ApS
Mose Allé 20, DK 2610 Rødovre
Denmark
6
ADJUSTMENT PROCEDURE:
CAUTION:
Before making any adjustment let the unit heat-up at least 15 min.
Observe that the offset-voltage measured at the side chain jack socket, when the
THRESHOLD is off, is not greater than +/- 15 mV DC in both position "fixed" and
"manual".
(tip is bus 1 and ring is bus 2).
If the voltage exceeds this value, replace either IC1 or IC2.
THE GRE SHALL BE MARKED BETWEEN 1.225-1.285
ADJUSTMENT OF BASIC GAIN:
1) Apply a signal of 1 kHz, -30,0 dBU into the input of the compressor.
2) Turn the GAIN-control fully clockwise.
3) Set the RATIO-control at 2:1
4) Adjust the pre-set GAIN (located on amp/psu PCB) to an output-reading of 0,0 dBU.
ADJUSTMENT OF COMPRESSION TRACKING:
1) Turn the THRESHOLD-control fully counter-clockwise.
2) Set the RATIO-control at 2:1.
3) Set the BUS-select-switch at 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) Apply a DC-voltage of +250,0 mV into the side chain jack socket (tip) and observe that
the output level has dropped to -10,0 dB.
7) If this is not the case, adjust the level with P 2 (P 1)*, to obtain a drop of exactly -10,0 dB.
* The trimpots in parenthesis refers to PCB 870316-0,1,2
( 980810)