2. amps-preamps
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Tube Life Artifacts

I've been using the same tubes for almost 12 years. They are RCA EL84s (6bq5) in 1959 Leak TL12 plus monoblocks. Recently, I have noticed that one channel seems to be "deeper" in soundstage, almost like there was more reverb on that channel. It's a mild difference, more noticeable on some recordings than others. This difference is consistent with both vinyl and CD, and switched sides when I switched the speaker connections.

Is this evidence of tube deterioration? I have a set of unused Philips tubes somewhere in the basement (made by Mullard, I believe) and I'm about to switch them. If I can find them...
dragunski

Showing 3 responses by rcprince

rcprince
2,830 posts
 
I was going to suggest the microphonics possibility as well.  I think you should switch tubes between the amps to determine which tube might be the culprit.  After 12 years, though, it might be time to try new tubes to see if you've lost some frequency extension and dynamics.  You may be pleasantly surprised.
rcprince
2,830 posts
 
I would suggest going to Andy Bouwman at Vintage Tube Services for your RCAs and for his recommendations as well.  Buying tubes on the internet can be a crapshoot; Andy has the real deal, and his advice is priceless as well.
rcprince
2,830 posts
 
For real Telefunkens, that's not a high price.  Part of what you pay for with reputable dealers like Andy and Brent is their testing and knowledge (there are fake tubes out there).  The premium is, in my view, worth it.
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