• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Amplifier Problem - Need help!

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maxzimum

Member
Joined 2005
Amptech,
It does not oscillate at low volumes. I was only worried that if it is oscillating at louder volumes, its not harming the amp in any way. My amps use 4 x 845 tubes each and I don't want to replacing tubes!

I do have a ground loop issue that I'm working on. I thought the transformer will solve both these problems.

Thanks,
 
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amptech

Member
Joined 2009
If your valve amp is oscillating it's not a good idea to connect a speaker to it, instead apply a 10 ohm say 50 or 100w resistor and hook it to a scope. then apply a 1khz sine wave to the amp, you should see a clean wave on the scope..

it's a pain when you've checked things and there's a low level hum being heard...
 
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