Have you ever tried Svetlana Winged "C"? Those were the KT88 I'd prefered when I had an integrated amplifier with that kind of tubes.
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Unless they've changed the top cover plate of the Magnum the power tube holes are not big enough for KT88s , they are either for the EL34 types or the higher power KT90, mine is 2 years old and that's the way it is with this. The KT90 to my ears is not warm like some KT88s I've have/had in other amps
Thanks Facten. I did find the extenders on both tubemonger and tubedepot. Also I spoke with Mark @ Rogue and he has told me that rolling KT120's is ok and will present no problems electrically for the cronus magnum. So the only issue remaining is clearance through the top cover of the unit.
I'll post back in a few weeks after a proper break in period. My current set up:
Rogue Cronus Magnum
Vandersteen 3A Sigs
Audioquest Rocket 33