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Thread: Tube going out?

  1. #1
    Junior Member
    Join Date
    Oct 2013

    Tube going out?

    I have a 2 channel h combo and its making intermittent crunchy echo-y fuzzy noises. I found a thread here of someone else having similar probs and the thought was that possibly a preamp tube 'went harmonic' or something like that. Have been trying to find that thread.
    I actually just got it a month ago so could send it back, but already had the mail system thrash one to the point it didn't work so returned it and this is its replacement. I do trust PRS but NOT the mail system. I will plan to get fixed locally but seeking knowledge/ advice on problem and also need schematics.

  2. #2
    Senior Member 11top's Avatar
    Join Date
    Apr 2012
    I had a similar problem on my 2 channel custom. I changed a bad preamp tube and all is right with the world (well almost).
    Sh*tter's full

  3. #3
    Senior Member prscat33511's Avatar
    Join Date
    Nov 2012
    can you try swapping a preamp tube?
    Tap lightly with a pencil eraser or a chopstick
    Maybe the tube is not seated properly due to abusive shipping procedures from the carrier ?

    BE CAREFUL - tube amps have lethal voltages and could hurt you in a bad way, tubes get hot also
    Dont try this if you are unfamiliar or unexperienced in this procedure

  4. #4
    Junior Member
    Join Date
    Jul 2012
    Yes, I had a preamp tube go out in my 2 Channel H combo a while back. That may have been my thread you read in the amplifier forum. I replaced all five preamp tubes with JJ's and it's singing again! There is one other tube that drives the reverb (the 12DW7 near the power transformer) that I did not replace. Word here on the forum was that it was probably not the culprit. I did not replace the power tubes either, but I found it helpful to remove them to get to the preamp tubes behind them. Removing and replacing the sleeves of the tubes near the reverb housing is a bit tricky, but just take it slow. Good luck!

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