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redplating

  1. James Cox

    Pilot 240 motorboating

    Alright so ive got a real stumper here. I purchased a pilot 240 integrated tube amp a couple of years ago from a kid on clist who had been using it as a bass guitar amp. When i got it one of the powertubes was redplating and there would be a crazy thumping, motorboat sound. This was my first...
    • James Cox
    • Thread
    • help integrated amp motorboating pilot redplating repair thumping tube
    • Replies: 49
    • Forum: Tube Audio
  2. G

    Tube red plating the first 2 seconds only

    I got 8 nos cv4024 (12AT7) When I start my amp MC275 they glow bright orange the first 2 seconds I think they are red plating After that they are fine and sound great is this normal ? Same thing happens on my tube tester Hickok 6000 on all 8 of them. They test great. Only happens when I power...
  3. ssouci

    X-202: one tube suddenly redplating!

    HELP! I recently did some work on my Fisher X-202 upon turning it back on, it started playing, but it sounded odd and I heard a lot of general distortion (at least in the R speaker, which I was sitting beside)... then I noticed one of the four output tubes was glowing BRIGHT RED, so I...
    • ssouci
    • Thread
    • glowing red red plating redplating tube
    • Replies: 8
    • Forum: Fisher
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