Tube Tech CL 2A Dual Opto Compressor - Manual (Page 5)

LYDKRAFT ApS
Mose Allé 20, DK 2610 Rødovre
Denmark
5
ADJUSTMENT PROCEDURE:
CAUTION:
Before making any adjustment let the unit heat-up at least 15 min.
Observe that the offset-voltage measured at the sidechain jack socket, when the
THRESHOLD is off, is not greater than +/- 15 mV DC in both position "fixed" and
"manual".
(tip is link 1 and ring is link 2).
If the voltage exceeds this value, replace either IC1 or IC2.
THE GRE (GR1) SHALL BE MARKED FROM 1.005 TO 1.175
ADJUSTMENT OF BASIC GAIN:
1) Apply a signal of 1 kHz, -10,0 dBU into the input of the compressor.
2) Turn the GAIN-control fully clockwise.
3) Set the RATIO-control at 1,5:1
4) Adjust the pre-set GAIN ( P1/P101 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 1,5:1.
3) Set the LINK-switch at link 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 sidechain 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 6 (-10dB), to obtain a drop of
exactly -10,0 dB.
(981214)