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 mrtennis

mrtennis
3,295 posts
 
i have noticed an increase in treble energy just before a tube dies. i have also experienced a crackling sound that can very load just before an amplifier output tube dies. it always pops a fuse, rather than damging my vtl deluxe 120. once i experienced a failure of 2 12ax7 tubes on my mac 275.
there was no warning sound prior to the tube failure. here again, a fuse was blown and i was able to determine which tubes needeed replacement.
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