The optical element is placed after the input-transformer and is followed by an all tube based amplifier with +30dB of gain. The compressor is controlled by the sidechain amplifier, which also contain the 2 time control circuits - one for fixed and one for variable attack/release. The 2 controllers can be used either separately or combined.
The amplifier consists of 2 tubes (valves) in push-pull configuration (one ECC 83 as the pre-amp and phase splitter, and one ECC 82 as the output stage), and an output transformer. Both the input and output are transformer balanced and fully floating, with a static-screen between the primary and secondary wirings.
A dedicated key switches the compressor in and out without clicks, although the amplifier remains in the signal path. An 11-segment LED display shows either output level (as VU-meter) or gain reduction. A red LED on top of the display, shows when output clipping is being approached. A dedicated bus selector with 3 positions is used whenever linking several compressors is required.
Tube-Tech CM1A Compressor Module Features
- Optical based compressor with a unique low distortion gain-reduction element
- All tube-based push-pull amplifier
- Multiple compressors can be interconnected via 2 buses on the RM8 table-top frame
- Variable threshold
- Continuously variable attack and release times
- LED display for monitoring compression or output
- +30dB make-up gain
- Click-less bypass switch
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