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What causes a tube to fade to black?

And by "black" I mean drop all output sound?

I recently purchased a pair of Pope 6V6GT output tubes from a fellow on US Audiomart. These were purchased from Upscale Audio and sat around unused.

When I put them into my system, one of the tubes just shut down in about 10-15 minutes. The music faded to black like I had shut down the amp without shutting off the music playing. I swapped the tubes around and the other channel shut down within about 10 minutes.

What causes a tube to behave in this manner?

My only experience with tubes going bad has consisted of them getting statically, making popping sounds and the lights getting brighter. Never just a quiet dying out.

Thanks.




"Man, that mouse is Awesome." - Kaemon (referring to Jerry, of Tom and Jerry fame)


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Topic - What causes a tube to fade to black? - AudioDwebe 08:18:01 05/07/20 (4)

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