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apt

  1. tutor_turtle

    APT preamp with a dead spot in the volume pot

    Working on a Tom Holman "APT" preamp, Nice and clean, only repairs look to be a relay that is clearly not original. Came in with a "dead" channel complaint. Traced it to the volume pot with a dead spot on both channels at the 10 O'Clock position. Must have been stored like that for decades...
  2. ViperZ

    Apt Amplifier Model 1 amplifier question - buzzing

    Hi all, I rebuilt Apt Power Amplifier Model 1 amplifier, but have this weird condition that I don't understand. When no input is connected, there is loud buzzing (transformer-like) through only the right channel (it's much quieter in the left channel). As soon as I connect RCA input from my...
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