Lol! Now we have something to go on. I left it on while working on something else. After about an hour it started making huge noises on channel 1 & 2. Channel 3 remained ok. I had just started scoping around for the noise...a nice firery in the pc board short developed between pin 5 (heater) and pin 8 of the v3 (ecc83 pre-amp). This tube appears to only serve channels 1 & 2.