New tubes in Rogue M-180 Monoblocks

Indeed, I meant KT-90, not KT-80. Thanks for the correction, Mechans.

I understand the only "modification" necessary is swapping the top plate in the Cronus amp as the tube holes are not big enough to accommodate the KT-120. I'm not sure whether other Rogue integrated amps would work with this tube. However, the M-180 monoblocks already came with holes big enough so that it's as simple as swapping the tubes. No circuit modifications are needed.

I would double check with Rogue to be extra sure if your current pair M-180 monoblocks can handle the Tung Sol KT-120 tube to be extra sure.

The 120's draw greater heater current then the 90's. You have to make sure that your amp will handle that.
Alan

I've been running KT-120s in my M-180s for about 6 months. I'm still using the 12A*7 tubes that the amps shipped with.

Yes, I'd say it's worth it. My comments at the time I did the replacement were:

"They just give you more of everything: more treble, more colors, more drama. As happy as I was with the original sound of the Rogues, I always wanted a bit more texture and warmth on massed strings, and the KT-120s give you that."

Also, from what I've read, the KT-120 is a more robust tube than the KT-90. Depending on usage, I'd expect to have to replace 1-2 KT-90s a year (and a fuse blows when the tube blows). I haven't had a KT-120 blow yet, but only more time will tell.

08-29-12: Daverz
Also, from what I've read, the KT-120 is a more robust tube than the KT-90. Depending on usage, I'd expect to have to replace 1-2 KT-90s a year (and a fuse blows when the tube blows). I haven't had a KT-120 blow yet, but only more time will tell.

That seems like very poor longevity/reliability from the KT90 tubes - unless you're running the amps 24/7?
I bought my ARC amp S/H and I'm still using the same output tubes (SED winged C 6550) after 2 years. ARC tend to run tubes on a pretty rich bias too.