Quote Originally Posted by RalphH View Post
Yes, have been having a conversation with Evatco. No mention of the Tung-Sols potentially being faulty. Check out the amp, etc...
The amp's performing like a trooper with Tube depot 7025's and NOS Mullards, so I'll just leave as-is for now.
When the cause is eventually determined, I'll share accordingly...

Just a thought, has the amp ever been in transit recently?, ie, being transported from one place or another?, also, was the amp recently moved from a warm environment to a cold one after it had been powered down after use?, that can sometimes end in tubes cracking.