I don't like the JJ 12AU7s. Kinda bloomy and not dead quiet. I also have Telefunken's, Mullard, Shugangs, and FunkWerks and BEL in my collection. JJ wasn't the worst though.
Going by my experience with 12AU7s I would not naturally buy 12AX7s from JJ. The general question I have is can one series of tubes by a brand be vastly different from another series from the same maker? I would assume the quality of tooling in the plant to be similar overall across all tube types and production lines. Or am I wrong?
Unless gain is very important - people seem to think that a lower gain 5751 sounds more natural than a 12Ax7. A Jan-Philips 5751 would be a good choice .
HTH
--G
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When I decided that I will stay with my current amplifier for good,I have tried almost any ECC83 there is and was.I ended up prefering buying used Mullards and/or RCA's than any new production ECC83.My decision was of cource based on listening,according to my subjective taste and in my system.Try the chinese TJ too,the best new production ECC83 for me,but be aware of grade B's etc........there are lots of them out there.Stay away.
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I retubed a Peavey Penta with KT77s for a friend and replaced the original 'Mesa Boogie' labeled 12AX7s with JJ Spiral 12AX7s.
He was very pleased with the results and described the tone as "rich and creamy" compared with the previous Mesa Boogie tubes which he described as having a harsh breakup.
He was very pleased with the results and described the tone as "rich and creamy" compared with the previous Mesa Boogie tubes which he described as having a harsh breakup.
I saw JJ on Amazon the other night The only review was for a Marshall amp. So, I had no idea before you mentioned it. Does it make any difference if you go with gold pins?
Just ordered a small Jolida hybrid for my desktop. Two 12ax7's. Figured it would not hurt to stock up now. Thanks.
But, just located this: http://www.jacmusic.com/tesla/tesla-jj.html
What to believe?
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The gold pin JJ 12AX7 is not the same with the standard one if I remember well comments from a couple of distributors.I've tried both,no clear winner for me.Both loose compared to my used old,or nos favorites and others I've tried imo.Not bad however,one of the good new production ECC83's and almost the cheapest you can get.
I don't know if the story is exactly like this but it must be close.And true,using the old tesla machines may not be enough,like it was not enough for ei to make an equally good telefunken or philips.
That's a different tube. ECC88. There are lots of good choices there. I bought some of the best I've ever used about 2 years ago at under $7.
Not really. It tells you nothing about linearity, noise, or microphonics, nor does it say anything about how the tubes were tested. It's meant for tube collectors, not anyone serious about tube audio.
It takes a poor circuit (guitar amp?) for a simple change of valve to produce a significant change in frequency response. Valve reviews based on guitar amps tell us very little about how the valve will behave in a well-designed hi-fi amp. I suspect that in some cases a change in distortion is being misinterpreted (by ear) as a change in frequency response.
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