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In Reply to: RE: PSVANE KT120 posted by audiomaniac on April 15, 2017 at 20:32:41
I was the one who posted my experience with the Psvane KT120s. Just for the record, I did not go back to Tungsol KT120s. That is a very average sounding tube in my Rogue and I do not use them.
I agree with Nunki, the PentaLabs KT88SC (now know as the Prefered Series KT88 available from thetubestore.com) is a much better sounding tube.
Currently using EI KT90 type one (red VTL logo) and these are excellent sounding tubes. The Gold Lion KT66 also works well in the Rogue (have about about 350 hours on them so far no problems)I intend to soon try (again) the Gold Lion KT88 reissues-the first try years ago did not go too well.
I like the sound of all the fancy (re expensive) Treasure and Pisvane Kt88s and KT120s, they just don't seem to be able to operate reliably in my Rogue amp. Maybe it is the high plate voltage Rogue uses.
Edits: 04/18/17Follow Ups:
Thanks for all the great information! I just might try one of the other suggested tubes in my Rogue Cronus Magnum. I wonder if I would set the bias the same as the KT120?
If your Cronos Magnum operates the same as my Stereo 90 (and I think the amp sections are very similar), you bias KT120/KT90/KT88 at 35ma on the built in meter, and bias KT66/EL34/KT77/6L6gc at 30 ma.
Check with your manual or contact Rogue (great people to work with) if you are unsure.
Try some different output tubes tube rolling is fun with the Rogues!
35 mA always works and you do nothing wrong. but trying some mAs more can make sense and is audible instantly. so with my rogue i had best results in performance in all aspects with KT120 at around 38 mA. pitching the bias up to 40 mA is no problem at all for KT88/90/120 and your amp either. (the rogue´s fuses would blow at 250 mA, right?). running under 35 mA makes no sense. you would notice your amp sounding cold, boring and dreary. over 40 mA the sound from my gear became narrow, harsh and stressed.
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