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In Reply to: Scout/Coronet II and Maggies finally got TUBZ ! posted by HenryH on April 26, 2007 at 06:13:09:
Holy Crap Henry!?!?!How is the output tube's biasing scheme on that thing? Does it allow for individual output tube biasing? Two matched quads of even late, XF4 series Mullard EL34's will run you into kilo-bucks in the NOS output tube market!
What does it come with for EL34's? I kind of like some new Russian EL34's in my Dyna MkIV's.
--
Al G
Born To Tinker!
Follow Ups:
EL34 version of the 12AX7-Ms. I've got a pair of matched quads. They set me back just over $100 per matched quad. There are two ways to bias on the JD-1000RC. You can just use the bias LED next to each output tube. There is a trim pot just below each LED. Or you can use an external VOM to the 4 test points per channel.
The stock tubes are Jolida branded, most likely sourced from the same Chinese source as other Jolida tubes.
Henry
I think these are about 40 per tube if I remember right....Check also to see if you can roll C6A7 tubes or KT-77's. I find the KT-77 tubes have much more air and high frequency response and a very tight bass line.
My preference is the Phillips style big bottle C6A7's that I have in my Precision Fidelity amp. I am getting superb bass and midbass and a very clear midrange. I like the highs too, they seem natural and not tizzy in the least.
although in my case (Rogue Atlas), they are E-H, not nos.
I also have used the JJ KT-77 in the Atlas and it too is excellent.
You cannot go wrong with either.
These sound like the same ones. EH builds these Phillips equivalents and they sound really full and rich.
Electro-Harmonix 6CA7EH
matched quads of JJ KT77s. They likely will be the first set of finals I roll in.
Henry
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