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gfa-555

  1. KingWzrd

    Hafler DH500 Channel Out Help Needed

    Hello everyone, I have a DH-500 that recently had the right channel stop putting out sound. I've read a few posts about ensuring the relay clicks when the amp it switched on (it does) and all fuses inside and the back are not blown. The light is normal on the front of the unit and the fan is...
    • KingWzrd
    • Thread
    • adcom amplifier diagnosing diagnostics gfa-555 hafler
    • Replies: 5
    • Forum: Solid State
  2. B

    Adcom GFA-555 Help Needed

    Hello, I picked up an Adcom GFA-555 with a blown left channel. As you can see, I've circled in red the burnt resistors (R1 and R7) and transistor (Q8). I'm assuming the problem is a blown output transistor, but I wanted to see if anyone has experience with this particular problem. If you...
  3. Silentnet

    Martin Logan reQuests, Emotiva PT-100, Nakamichi PA-7AII

    Made a new thread since the system changed so much. My "source" is a PC/PS4 Pro/LG OLED run though an Emotiva PT-100 acting as DAC and preamp / volume control -- USB for the PC, TOSLINK for everything else -- to a first gen Adcom GFA-555 (true Nelson Pass design! ;)). The reQuests are wired to...
  4. thorpej

    Adcom GFA-555 with dead left channel

    Hey folks -- A friend of mine has an Adcom GFA-555 with a dead left channel. I'm pretty comfortable servicing tube gear and solid state not so much, but these Adcom amps aren't terribly complicated, so I'm taking a crack at diagnosing the problem and repairing it for him. I had a few free...
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