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Thread: Crackling Peavey Triple XXX

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    Twobie
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    Crackling Peavey Triple XXX

    Got a Triple xxx on a trade that made noise and replaced the power tubes and set the bias. As I was talking to a tech at Peavey about the noise I was hearing the amp started to hum loudly and the two left power tubes were glowing cherry red. I shut the amp down. I swapped the position of the tubes per the tech and powered the amp back up. Now no sound.... any suggestions. Going to check the screen resistors.

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    Supporting Member The Dude's Avatar
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    Schematic here:

    https://www.thetubestore.com/lib/the...-Schematic.pdf

    You may have an open HT fuse. Check F1. Sadly these days, new tubes does not always mean good tubes. After you get power back up, I'd leave the output tubes removed and check voltages at the tube sockets. Make sure you have screen voltage and bias on all tubes. Then reinsert the tubes one at a time and see if one causes problems.

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    Lifetime Member Enzo's Avatar
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    Agree, the red plating tubes probably blew the HV fuse.

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    Quote Originally Posted by Enzo View Post
    Agree, the red plating tubes probably blew the HV fuse.
    I thought I would put the old tubes in before getting too far into it and it powered up and had output. I thought I would check the bias before running it thought its paces and I get no reading on the bias......??

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    Lifetime Member Enzo's Avatar
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    Putting old tubes back in it will not "heal" a blown high voltage fuse.

    Welcome to the forum, but I have to nit pick. The only time you get "no reading" on the meter is when the meter is turned off. Zero volts or infinite resistance or whatever are still readings.

    If your high voltage fuse is blown there will be no high voltage for the tube to make current with.

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