What about output tubes...KT-88, KT-77, KT-120, KT-90, KT-99


I would be interested in your results with different Russian output tubes, sound , quality , price........All around ??
autospec
Be careful of the heater currents the KT120, are up to 500mA each more than a KT88 times this by 8, and you can cook the heater supply, and it probably sagged below 6.3v because of it. My bridge rectifiers crack in two on my Rogue's when I owned them.

Cheers George 
George, what rogues did you own? I own m180s and was told by Mark Obrian 120s would be no problem. 
From memory they were the 150 monoblocks. It took a couple of months before the bridge rectifiers went, then I put in some much lager 35amp ones and all was fine. Not fun though when they go.

Cheers George
PS: something that slipped my attention, is that you also need to look at the power transformer’s filament (heater) winding to see if it can handle the extra current as well and without sagging.

Cheers George