120hz hum

  1. Paul-McShartney

    Twin Reverb Buzzing Issues

    I was wondering if you guys can help me isolate the noise issue with my 65' Twin Reverb Reissue. Things I've noticed with nothing plugged in the amp: -buzz gets louder as I turn up vibrato channel volume, and lesser so when I turn up the normal channel -buzz gets significantly louder and in...
  2. OahuClay

    120hz hum in Bassman 135

    I'm scratching my head on what to check next, got new electrolytics, and with the 12AT7 removed its still there, kind of a saw tooth, tried fresh tubes but still there, goes away when tubes pulled, appears instantly when b+ turned on, checked the two 100k' ohms replaced them anyway, all the...