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In Reply to: Re: cary v12 tubes posted by claud on September 09, 2003 at 04:56:24:
I really enjoy my V12i with the Svetlana EL34's. But, I have thought about trying kt-88's or kt-90's. My question is, since it is often difficult, or nearly impossible, to find 12 matched tubes...can I buy three matched quads from different sellers? If I do this, how do I put in the matched quads - are the pairs aside of each other or do you put the similar tubes back through the row?
Follow Ups:
Just spoke to Greg at Cary about this today as I am trying out Valve Art KT88's in my V12. Greg says the tubes don't really have to be matched at all and they only recommend a matched dozen so they wear evenly. Just the same, I used 3 matched quads, with two of each quad per channel. Am about only about 2 hours of play into the tubes and they are sounding better and better. Definitely different from the Svetlana EL34's they replaced. The EL34's seem to have more air and delicacy, but mezzo-soprano's sound more like mezzo's rather than soprano's with the KT88's. The detail and layering seem pretty good with the VA KT88's so far...
You can use two matched sextets, you don't need 12 matched tubes.I recently retubed a guy's Cary with EH KT-88s. I "torture test" these since some go into Citation II amps where they are run quite hard. Bottom line, he was just thrilled with them.
If you buy KT-90s, be careful. Current production stuff has been poor quality, and not all vendors catch the bad ones. They are great tubes when they are right though.
I have two sources for matched output tubes everyone on this forum is familiar with: Kevin Deal at Upscale Audio can supply matched, tested and burned in tubes in sextets and octets. I've also purchased output tubes in these kinds of quantities on sale at thetubestore.com. You just have to specify that you want them matched on your order. If there is a supply problem they'll inform you. In the past, I have bought octets just in case there's an early life failure, but I haven't had this problem.
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