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One channel has lower sound
One channel has lower sound
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Old 21st August 2019, 06:58 PM   #1
Duke58 is offline Duke58  United States
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Default One channel has lower sound

Two 6L6GC tubes in a Tubelab SSE amplifier. One channel sounds lower.

Switched the tubes, lower sound followed the tube. Tested both tubes, the tube with the lower sound has a higher transconductance reading in micromhos.

Anybody know what would cause this?
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Old 21st August 2019, 07:53 PM   #2
wiseoldtech is offline wiseoldtech  United States
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What you're asking is something that takes a book's worth of reading to even understand.
Because there are several parameters involved, and trust me, I'm not about to spend the time to type it all out.
If you're the average consumer, the usual and basic thing is to test for emission of tubes - a simple tester can do that.
In your case, you probably have a tube that's aged, or slightly defective in manufacture.
Get a new matched set and enjoy the music.
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Old 21st August 2019, 08:52 PM   #3
Duke58 is offline Duke58  United States
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Alright, then. I did test the emission of the tubes...

The tubes are a couple hundred micromhos different. I would have thought that the tube with the higher transconductance would have been louder.

Don't want to cause any sore fingers, so I'll read some more. I have other tubes I can run with the amp. Thanks!
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