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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

noisy rectifier tube


2007-09-24 3:22 pm
hello there
i have finally got my SE tube amp working.

picture below

however i have noticed that the rectifier tune is making an audible noise, it doesn't sound like a hum more of a sort of creaky squeal. its not that loud and doesn't seem to affect the sound from the speakers.
i noticed that if i clamp my fingers round the tube (when its not too hot off course) the sound is a bit quieter. is this normal

is there potentially something wrong here or is this normal



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does this noise stop once the rectifier has warmed up?

If so, it just the current rushing into the rectifier and producing a squealing or banging and clanging noise.
I've had the same "problem" with an EZ81 on one of my headphone amps (and I asked about the noise here, too...).

I my case I just added a bit of resistance (220 ohms) before the rectifier tube, and now I have silence.

my 2 eurocents...;)