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In Reply to: RE: 12AT7-tubes for Preamp and Poweramp :JJ vs Telefunken NOS posted by airtime on February 28, 2017 at 07:10:25
Hi, airtime: My preamp and poweramp were made by AVA which specified using a lower gain of 12AT7 tubes . As you have mentioned the Genalex gold lion 12ax7 is that good/excellent; I assume their 12AT7 should equally be as good ,hence, I am so tempting to get them Thanks for your info and suggestions
I have an AVA FET valve CF preamp and 600R power amp. I replaced all the stock JJs
with Mullard CV4024 (12AT7) and Mullard CV4003 (12AU7). Everything improved over
stock including much better midrange and highs. This combination will give you a nice touch of warmth without going too far.
I've been researching AT7s for my amps driver stage and see in the archives here it's Jim McShanes favorite, BUT, one must be careful to get them tested for microphonics.
Some UK adverts for the tube cite it's construction being good for eliminating microphonics so I'm not certain what's what. I do see that NOS, sealed box CV 4024s go for around $70/pair. Not too bad.
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