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adcom 555 ii

  1. vinylvirgin

    Nasty hum in Adcom GFP-555 II preamplifier

    A while back, I got an Adcom GFP-555 II preamplifier. On powering it up initially, I found that signals monitored through the unit's headphone jack sounded just fine. The sound coming from the unit's main output was another matter. It had a nasty 60-cycle hum. Has anyone here who has owned this...
  2. LLAnalogue

    Intro from Chicagoland

    Hey all, Intro time... Hope everyone's having a great day so far. I've lurked for a while but a recent restoration project prompted me to finally join. I bought a working Sansui AU-717 in the fall of last year from a nice gentleman advertising on craigslist. Everything was good until a one day...
    • LLAnalogue
    • Thread
    • adcom 555 ii b&w n801 introduction marantz 6100 oppo 105 sansui au-717
    • Replies: 13
    • Forum: Introductions
  3. plresults

    Adcom GFA 555 II - AC fuse question & fuse holder needed

    A fellow gave me is subject amp today for free. He only said it does not work and that he changed the fuses. Upon inspection: - the switch in back was in mono-bridged position, so perhaps why he thought broken - the fuse in the AC fuse holder is a 20A fuse, way above the 12A spec. Two...
    • plresults
    • Thread
    • adcom 555 ii damping fuse fuse holder yamaha m2
    • Replies: 11
    • Forum: Solid State
  4. Gaerisch

    Adcom 555 II

    I have an Adcom 555 II. I’m the original owner. What’s the story with these amps? I heard they have no speaker protection relay. Does anyone make a kit that could mod this amp with a speaker protection circuit? I’ve had no trouble from my amp and it’s currently hooked up to Magnepan MM 12/QR...
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