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In Reply to: RE: Most likely, it is perfectly OK. posted by 2con on July 14, 2014 at 12:47:44
As long as you can set the bias individually for each tube (so the push/pull pairs draw roughly the same current), there is no problem mixing and matching different EL 34s.
As for what to try for the OP, I suggest the Treasure 6CA7 from China. I actually prefer these to Mullard xf2 in my amp as I find the Mullards a little too full in the midrange for my taste. Have not tried the pricey Pissvein versions. I also like the JJ KT77 which some have had problems with but my quad has been flawless. Cheap to try, less than half the price of the Treasures or the Genelex KT77.
Can you use 6L6gc/ KT66 in your amp? Many prefer these to any EL34. The Russian NOS 6n3c-e is a great sounding tube that is cheap and will work in many EL34 amps.
Follow Ups:
Mv 50 allows to bias individually ,so i know i can't harm anything.
It was orignally voiced with Sylvania /Philips Ecg 6ca7 ,a beatiful
and rugged american tube .
I' m curios about every 6ca7 ,being beam terode ,vs pure el34
,penthode.
The treasure 6ca7-z go for 596 eu for a matched quad (a lot of
money9.
My point was :is it possible for you to reach the top of satisfaction
with cheap russian tubes like eh and tung-sol for examples ,mixed
together .
My Mullard xf2 quartet,for example, doesn't sound so lively as the
mixed el 34 eh-tung-sol quad ,wel matched and individually biased.
If anyone has an el 34 based amp and two spare quartet of eh and t-s,
have ever tried this mix?
I think could surprise ....
That's what i found coming from a perfectly matched Winged c el34 and
rft quartet ,in my amp in my rig ( but i know the amp like my wife ...
no i know my amp better ...especially in August :-)
I have been very impressed with the Electro Harmonix Big Bottle 6CA7. The seem to do magic with my amps (Consonance Cyber 800 Monoblocks). I don't usually care for the Russian output tubes. These just rock the house in my amps full and big sounding to match their girth. I don't think they come close to the cost that the other OP tubes mentioned do.
Steve
You might also try some of the re-issue KT77 tubes, which are not too expensive.
Thank you guys
Eh 6ca7 fat bottle has been my reference tube in mv 50 for years :
it was the safe path!
I have the original genelex kt 77 .a perfect matched quartet:i've
never tried them ;there will be the right time .
Listening from baroque to techno ,i wait a long time before
judging a tube ,or a certain mix of tubes;i try to be the more
scientific that i can ;i measure tubes of the same batch
and then listen tryin to exrapolate a paradigm.
My experiments may last months on the very same tube.
I found that often ther's no reason to prefer nos on new tubes or
vic eversa :a good tube is a good tube ,first because it's in his
specs,second (but very first)because do the trick ...the magic.
I often can't tell if two tubes having same specs ,sound the same :
maybe one is magic ,the other only good .
For sure G.e,telefunken ,tungsram,old tesla etcetera produced great
tubes ;but the magic tube hide itself sometimes beyond a dark getter
or a common 6h23ev.
Turning back on thread :now i'm focused on common russian el34 :
i've always thouht that eh el 34 was only an honest tubes ,but i
found that it was magic mixin it with Tung-sol el34 -b.
So assuming that a push -pull can work correctly only with
a balanced series of electrical parameters (transconductance,
gain,etc.),that it's what i wanted to point it out .
I wanted to share this experience with this particular amp ,and curious
to know if anybody had similar experience ;just to learn more ,
and not for saying the tube A is better than tube B.
Thank you for your kind attention.
Marko
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