'65 BFDR makes a loud frying/storm noise??

Discussion in 'Amp Tech Center' started by J.Rodney, Mar 21, 2014.

  1. J.Rodney

    J.Rodney Tele-Meister

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    after the amp has been on for about 10 minutes/warms up it starts to make these noises,it is a very annoying noise:mad:,after a little while it settles down and is just fine:).What could be causing it to do this?? Thanks for a reply.
     
  2. muchxs

    muchxs Doctor of Teleocity

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    The short list includes:

    Dirty or loose contacts at a tube socket

    A preamp tube going bad

    A damp 'n' drifted preamp plate resistor

    A coupling cap that leaks DC for 10 minutes unti it re- forms.
     
  3. bparnell57

    bparnell57 Poster Extraordinaire

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    If none of that is it, it could be the cathode resistors. I had a noise issue with the ones in my Bell 2122b hifi amp, it comes and goes depending on the resistors temperature and the ambient humidity.
     
  4. Johnny Cache

    Johnny Cache Former Member

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    Start with the tubes process of elimination if that doesn't fix it then move on to the list above. Also I recommend replacing the filter caps if their the originals.
     
  5. J.Rodney

    J.Rodney Tele-Meister

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    Thanks everyone, I talked to my amp tech today.I am taking it to the shop next week. I will update this thread when I get it back.
     
  6. J.Rodney

    J.Rodney Tele-Meister

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    talked to my amp tech this evening and he said the only thing wrong was some oxidation in a tube socket{pre amp tube I think he said}needed cleaning, no parts or tubes needed and the caps looked fine.No more noises.
     
  7. priceamp

    priceamp TDPRI Member

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    You might have your issue resolved, however a constant frying pan sizzle sound is typically caused by the preamp load resistors.
     
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