Tube Tech CL 1B Opto Compressor User 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)