Rogue Cronus with KT-90 tubes

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 have the Cronus and used it with EL34's (ElectroHarmonix) which I loved, then upgraded to Magnum with the KT90's. I could easily be happy with either. I loved the dimensionality and warmth of the EL34's, but the KT90's just give way more a sense of "in the room" sound of musical instruments.

When I received my Magnum it came with NOS Sylvania 12ax7 & 12au7s, sounded pretty good , have since swapped them out for RFT 12AU7s and Tungsol 5751 (12ax7) and prefer the sound - RFTs to me anyway have a more similar sound to RCAs

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.