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Twister, help please!!!!

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  • #1

    Twister, help please!!!!

    I just got a used tube head and when it is turned up past like one or two, it makes a high pitched squealing noise. I am sure that at least one of the power tubes is bad. Could this be the cause of the problem or could it be something more than that?

    Thanks, DOn
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  • #2
    Re: Twister, help please!!!!

    sounds more like a preamp tube to me, but pete (twisteramps) will probably know best.

    i'd take it to a pro amp tech and get it checked out.
    Widow - "We have songs"

    http://jameslugo.com/johnewooteniv.shtml

    http://ultimateguitarsound.com

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    • #3
      Re: Twister, help please!!!!

      The Tube Amp Debug Page at http://www.geofex.com/ has a section on squealing, that might help.

      I had a power tube squeal to make your ears bleed... the wife loved that. [img]graemlins/laugh.gif[/img]

      K
      The JCF-er Formerly Known as axtogrind.

      myspace.com/boogieblockmusic

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      • #4
        Re: Twister, help please!!!!

        When I got in there and looked around at the tubes I noticed one of them had a blue plasma looking spark around it. I think this might be the problem. I switched between it and another tube and it did the same thing in the other socket.

        Now for my next question, where is a good place to order tubes from. My amp has a fixed bias so I dont need to have it rebiased.

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        • #5
          Re: Twister, help please!!!!

          http://www.thetubestore.com/index.html

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          • #6
            Re: Twister, help please!!!!

            Call Bob at www.eurotubes.com. He'll tell you exactly what you need.

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            • #7
              Re: Twister, help please!!!!

              www.dougstubes.com is a good place. I wouldn't deal with the tubestore, personally. Bob at eurotubes is ok too.

              If your amp really is fixed bias, it still needs to be biased! [img]images/icons/smile.gif[/img] fixed just means that they used a resistor in place of a bias pot. My '68 princeton was fixed bias - I had to replace that resistor when I changed tubes. The type of bias that is 'automatic' so to speak is called cathode bias.

              what type of amp is it?

              Pete

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              • #8
                Re: Twister, help please!!!!

                Its a Peavey Ultra Classic Plus. 120 Watts. I found an article on it on the peavey website but cant remember where it was. I know it has a quad of 6L6's.

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