Did you re-bias the KT120 tubes? In my Cronus Magnum 1, the factory supplied KT120 tubes had 3 years on them and I played the amp every single day. They still sounded great. Check the 4 fuses where you bias the tubes. 1 or more may be blown. If that isn’t the case, check the preamp tube, it may be dead.
Should I upgrade my Tubes
I have a Rogue Audio Magnum II which is 100 Watts per channel paired with Vandersteen Treo CT speakers. My tubes seem to be shot as suddenly I get no amplification (just very low level audio). The 4 power tubes are TUNG-SOL KT120. I have been reading about getting "better" tubes but every discussion seems to get into "depends how you like the sound" types of comments similar to every other audio component - LOL.
So what's a man do ?
So what's a man do ?