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Tapco 4400 stereo spring reverb rack unit for repair - $40 (Centennial)
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Before it was disassembled, one channel worked and the other didn't. I don't remember which is which. The power supply works, and the working channel can be used as a reference. Both reverb pans tested out correctly. Other known problems: the fader tip on input level 2 is broken off - tip included. I have no idea if the meter works; it's a dual vertical old-school mechanical meter fwiw. New production opamps are available and one or two will probably fix the other channel.