Call Rogue Audio at (570)992-9901.I think the people that made the equipment can give you the best advice.Good luck.
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I'd check again about the standard versions use of KT 90s - see below from their site re Magnum upgrade
from Rogue site - for Cronus which is in Titan series
The Rogue Audio "Titan MAGNUM" Series
The "MAGNUM" versions of the Titan series features significant parts upgrades that improve performance in your Atlas, Metis or Cronus in a number of important ways. Increased transparency, greater dynamics, improved bass and high frequency response, as well as a smoother and more refined presentation are all part of the Magnum upgrade. The extensive power supply mods permit the use of the KT90 power tube which increases the rated output power of the Atlas and Cronus to 90WPC!
The Magnum package consist of the following modifications:
Atlas and Cronus Magnum:
- Larger power supply
- Power supply mods
- Polypropylene bypass capacitors
- Precision Dale-Vishay resistors in critical spots
- Upgraded binding posts
- Gold tube sockets
- Upgraded small signal tubes
- KT90 output tubes
- Magnum logo on faceplate
I still have the stock Svetlana EL-34's in my Cronus. HOWEVER.....for me, a significant improvement in the all-around musicality of the amp came from swapping out the original five "small tubes" for a set of NOS RCA and GE tubes hand picked by Mark and Nick at Rogue Audio. For less than $200, I feel like I really upgraded my amp, and made my Vandersteens sound even sweeter. Just a thought......Good Luck, and Happy Listening !!
An update after living with the KT 90's in my Rogue Cronus Magnum I swapped back the EL 34's for a comparison (biased them properly, of course) and the result?
Can't wait to put the KT 90's back in. I think Mark & Co. knew what they were doing when they built the upgrade around that tube: light high end, tonally pure mids, strong controlled bass, nice sense of space. Listening to a live concert last week from the Benaroya Hall (where I regularly listen to the Seattle Symphony live) I heard someone cough and could identify how far back in the hall they were seated. I am done with messing around with tubes, on to optimizing my LP area now.
I have recently replaced the original Svetlana EL-34's with a matched quad of Genelex Gold Lion KT-77's, following the advice of Mark O'Brien and many "tube gurus" out there in audioland. The result are sublime. As much as I loved the Cronus before, I've brought it up to a whole new level. See my post on this thread from 11/20/09.
Happy Listening !