dark tube

Tubes Asylum

Questions about tubes and gear that glows. FAQ

I have a Cary SLI-80 equipped with KT120 tubes. I just noticed today that one tube is dark, no illumination at all.
I swapped positions and it is still dark.
I turn it on and it plays fine, both channels are there and equally strong.
Shouldn't there be a noticeable difference in volume at least?
I can hear no difference from channel to channel.
What gives?

Thanks for any help you can give me.
Without music what is there?

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Topic - dark tube - marlin 17:07:05 04/13/15 (9)

More Proof!! Don't Trust Your Ears! - Triode_Kingdom 18:39:47 04/13/15 (0)

RE: dark tube - BCR 17:44:55 04/13/15 (7)

RE: dark tube - marlin 18:11:56 04/13/15 (6)

RE: dark tube - Tre' 19:42:53 04/13/15 (5)

RE: dark tube - marlin 19:55:52 04/13/15 (4)

RE: dark tube - vinnie2 04:08:20 04/14/15 (1)

RE: dark tube - Bigjimsguitars 08:16:57 04/14/15 (0)

RE: dark tube - Tre' 20:56:36 04/13/15 (0)

RE: dark tube - Triode_Kingdom 20:16:15 04/13/15 (0)

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