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RE: Newly built amp was performing well...now oscillating

Posted by Garg0yle (A) on August 24, 2015 at 16:32:31

In Reply to: Newly built amp was performing well...now oscillating posted by DAK on August 22, 2015 at 02:11:59:

It could just be a noisy tube.
Hard to say without hearing it.

I have had some in the past make random subtle low level chirping sounds that go up and down in frequency, that I don't think was typical oscillation. It followed the tube from left to right channels.
Replacing the tube fixed the problem.

I just chalked it up to buying tubes on eBay.
You can get a barely used set of tubes that looks measures well, yet is a "noisy" tube.
I guess eBay is a good spot to unload these little sins as most might not notice right away.

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