2. amps-preamps
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Listening for tube degradation

Hey, just wondering what specifically there is to listen for in regards to tube degradation. I don't have access to test equipment so I have to rely on my ear to determine if certain tubes are on their last legs. I've been able to notice a definite "scratching" or muddied sound whenever one or more of the tubes are in need of replacement. However, I find myself replacing ALL of the tubes since I can never pinpoint which exact tube or tubes needs replacing. Also, are there any visual cues to look for (ie.output tubes glowing brighter than others)? I have a 15W integrated tube amp that you can look at on my system page.
hitman_hifi

Showing 1 response by lwerner

lwerner
58 posts
 
I also never had the equipment (or the knowledge) but learned a way after I made Heath and Dynakits, take cover off the amp and let it warm up,do not touch any part of the amp (be sure the selector switch is set to Lp or extra/cd whatever you are using, volume up a bit) and tap the tubes with a pencil. This may not tell you how much life is left in a tube as a Tester would, but if any tube makes any noise comming from the speaker when you tap it, static, spitting, burping, harmonics etc, it is done for and should be replaced.
Len W
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