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In Reply to: RE: Fed up with old stock 12AX7 RCAs dying or becoming microphonic! posted by Paul Kehayas on December 20, 2016 at 13:11:36
The RCA tall plate are a shame they go microphonic or are noisy. I had too many noise issues with NOS RCA 12AX7 tall black plate. The black plate just do not last long with regard to noise.I find no difference in sonics with NOS RCA 12AX7 tall grey plate. Few are noisy. I would not even consider any RCA 12AX7 used tube.
I did not care for Genelex reissue, but my amp is very revealing to 12AX7 preamp tubes. The amp is ultra clear sounding. Anything less of an amp limits the 12AX7 performance as the tube sonics become slightly smeared over.
Edits: 12/22/16Follow Ups:
Jim
I find that same thing with my RCA black plate 12AX7s.For some reason,my Raytheon black plates don't seem to have as much of an issue with microphonics on the 12AX7s.
They RCAs really do sound nice tho and I still keep them for amp drivers as they don't expose it so much like they do in a preamp.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Yes Michael, the RCA 12AX7 tall plate are great. You hear any difference in-between tall black plate & tall grey plate?
If I may ask, what was it about the Gold Lion you weren't a fan of and what were it's strong points in your system?
Paul
The Genelex sounded more ordinary vs the RCA that had more black in-between instruments and the singer(s) voices. Just a better soundstage & clarity.
My amp is DIY with triode connected PPP 6V6 tubes. I built same amp with PPP 45s and like the 6V6 amp better.
The 12AX7 was in the preamp position. The triode 6V6 was more lively sounding. Frankly, the amp is best I ever heard. I owned a lot of upgraded vintage amps.
I would be willing to bet the Genalex' softer top end is what you heard. It is quite often described in different terms, but "clarity" is usually a product of top end extension/energy.
That's why I like the Genalex/Tung-Sol combo - the two tubes have performance attributes that compliment each other very well.
Just my $0.02 anyway...
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