My Fairchild compressor is a hybrid. The original used a high voltage tube amp with a step down transformer to drive the side chain diode bridge. I used a high current solid state amp with a 40v rail and a 1:2 step up transformer. I also used an active output with high impedance input allowing the use of only 1 - 6386 tube [a considerable savings at $120/tube. The time constants are true to the original but with attack and release controls.
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