Tube Tech CL 2A Dual Opto Compressor - Manual

LYDKRAFT ApS
Mose Allé 20, DK 2610 Rødovre
Denmark
1
TUBE-TECH CL 2A
dual compressor
DESCRIPTION.
The TUBE-TECH compressor CL 2A is a dual opto compressor with a gain reduction
element, which have no long-term degradation and almost infinite life. This element are
placed after the input-transformers of the compressors and followed by an all tube-based
amplifier with a gain of - dB to +10 dB.
Thus the signal is not fed through any semiconductor circuitry on its way to the output.
The amplifier is based on two tubes (dual triodes) in push-pull configuration (one ECC 83 as
a differential amplifier, and one ECC 82 as the output stage), and an output transformer.
The power supply for the differential amplifiers is stabilised and the heaters of all four tubes
are fed with a stabilised DC voltage.
The two amplifiers (including input and output transformer) and the power supplies are
placed on one PC-board.
Both input and output are balanced and fully floating.
The compressors are switched in and out via two relays (click less).
THE SIDECHAIN:
The two side chains are the only part of the compressor that contains semiconductors.
It contains two J-FET quad op-amps, one npn-transistor and one FET-transistor, which
handles the signal for the gain-reduction element.
The compressor contains two time constants circuits:
1. Fixed attack and release times
2. Variable attack and release times
COMPRESSOR INTERCONNECTION:
The sidechain sockets for interconnection of several compressors are located on the rear
panel.
A switch on the front selects which compressors are interconnected, and on which bus they
are connected. If you e.g. have 10 compressors in a rack, you can select compressor 1,5,7
and 8 on link 1, and compressor 2,3,6 and 9 on link 2, leaving compressor 4 and 6 in the off
position.
Compressor 1,5,7,8 is now interconnected and all four will perform the exact same
compression. This applies to compressor 2,3,6 and 9 as well. Compressor 4 and 6 are
independent.
(150203)