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sp3a-1

  1. TSmith8605

    ARC SP3A-1 Repair Advice

    I recently inherited this pre-amp and got around to checking it. After complete cleaning of controls with F5 faderlube and cleaning of connections / tube sockets with D5 DeOxit, and testing (good) all 8 tubes, I turned it on and found the following problems: 1. The tone-control-defeat button...
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