Rogue Cronus questions...

*** Rogue dealer disclaimer ***

EL34's in the stock Cronus. KT90's in the Magnum version. You should be able to use EL34's in the Magnum version with no problems (slight adjustment on the bias).

No real audible noise from the units. You would certainly be hard-pressed to hear anything from 9' away.

You can use the EL34 in the Magnum, however you won't get the 90 wpc that the KT90s provide. Also, if you can find socket savers you can use the KT88 or KT 120s per Mark at Rogue (need socket saver because the base of the KT88 is too large for the opening in the amp)- bias at 35. Never had any noise issues with when I had my Magnum. Well made and excellent customer service before, during & after sale