Tube Tech CM1A Comp User 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 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 U1 or U2.
THE GRE SHALL BE MARKED BETWEEN 0.800-1.000
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 7, to obtain a drop of exactly -10,0 dB.
(
071221)