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In Reply to: RE: Update No. 1 on my EL34 recommendations post below posted by JoshT on February 21, 2023 at 07:19:19
Very good info, Thanks!
Since you can't get the KT120's. Lucky I have backups.
Please, What do you bias the JJ EL34II at in the CM II?
Follow Ups:
When I called Rogue, I was told 35mA, so the same as with the KT120s. But the fellow I spoke to was not Mark or Paul, and since then I've heard from some other CMII users who said that Mark recommends only 30mA and also says that EL34s won't last very long in the amp.So, I reset the bias to 30mA and I'll call back and ask for Mark to try to clarify all of this. It still sounds great at 30mA so for now I'm being cautious.
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"If you are the owner of a new stereophonic system, this record will play with even more brilliant true-to-life fidelity. In short, you can purchase this record with no fear of its becoming obsolete in the future."
Edits: 02/23/23
Josh Thank You! I would go with what Mark has said. They are very responsive, but they should give all the bias settings to the various tube configurations The original CM was EL34 tubes based.
Nick was unequivocal, so the guy I spoke to last week was mistaken.I mentioned the name of the fellow who said 35mA just so Nick could correct him (not to get him in trouble!) and Nick said he'd speak to him just for future reference. So that's all good.
Nick also said that the EL34s likely won't last as long as KT120s or KT88s in the CMII, which doesn't surprise me. The JJ lineup is all so affordable, so I might replace the EL34s with JJ KT88s anyway, at least until new KT120s are available and affordable, if ever. Also, I just bought an ST-70, which should make the EL34s sing. :-)
___
"If you are the owner of a new stereophonic system, this record will play with even more brilliant true-to-life fidelity. In short, you can purchase this record with no fear of its becoming obsolete in the future."
Edits: 02/23/23
Josh T.
When I had my Stereo 88 converted by Rogue into a Stereo 90 Magnum many years ago, Mark himself told me to bias EL34 and 6L6 and KT66 at 30 ma on the meter and KT88/KT90/KT120 at 35ma.
I never loved EL34 in the Rogue and I have a good collection of Mullard xf2. I actually like the JJ KT77 better in the Stereo 90, a pretty good sounding tube.
Now KT66 and 6L6GC, those are rocking tubes in the Rogue! Better than EL34 IMO, that's the tube you should try next. I like the GL reissue KT66 very much in my amp (much better than their KT88 which never sounded right to me despite all the love they get and I have 2 different quads) and of course the vintage GEC. Never tried the JJ KT66 but it's probably pretty good.
Enjoy the roll!
I've been curious about the KT66, and JJ makes one, including a blue glass version that's the same but looks cool, lol. They also make a 6550 and, of course, KT88.
What are your thoughts on the 6CA7 tube. I just bought a new build ST-70 with JJ 6CA7s and I love it. I'll probably try them in the CMII for the fun of it and see how the EL34IIs and 6AC7s sound in each amp. I will say I'm enjoying both amps right now (in different systems).
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"If you are the owner of a new stereophonic system, this record will play with even more brilliant true-to-life fidelity. In short, you can purchase this record with no fear of its becoming obsolete in the future."
I have not tried the JJ 6CA7. The only JJ power tube I've tried is their KT77. I have tried the EH 6CA7 and it was ok in my Rogue, powerful sounding but lacking a little refinement. The JJ E83CC is a very good sounding 12ax7 variant if you can find it, not sure if they are still making them anymore. The only modern production small signal tube I have liked, although they can still be bested by the best NOS. The 12ax7 input tubes make the biggest difference in the sound of the Rogue amps as they have the greatest amplification factor. But they all make a difference.
Edits: 03/01/23
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