Jeff. Per your thought that the 6c33c is quite destructive when they failed in your VK60s, and therefore you would not consider another amp that uses this power tube. Certainly any type of problem is a pain in the rear and I am sorry you had a bad problem.
It seems to me it is how the circuit in your amp dealt with the tube failure that caused the destruction you experienced. I am not aware that the 6c33c exhibits any unusual characteristics such that failures with that tube would result in problems that would not occur if a different output tube had a similar failure when used in the same circuit.
It seems to me it is how the circuit in your amp dealt with the tube failure that caused the destruction you experienced. I am not aware that the 6c33c exhibits any unusual characteristics such that failures with that tube would result in problems that would not occur if a different output tube had a similar failure when used in the same circuit.