bias problem

  1. Leftof88

    Pro Reverb - Redplating

    Hey Folks - I have a 1974 Fender Pro Reverb and both tubes are redplating. I've had this amp for years and it was working perfectly before I put it in my storage unit about a year ago. I pulled it out the other day and fired it up and immediately both 6L6's started redplating. Steps I've...
  2. J

    Blues Junior - extremely high voltage problem (1300 Vdc on EL84 plate)

    I have a totally stock Blues Junior 3. I was going to check the output tube bias, and do the "bias cooling mod" that I have seen a few techs illustrate on YouTube. I was probing voltages in the amp, and most look fine, except the voltage on one EL84 plate. Voltage on one plate is 1323 Vdc...