I have such an amp.(s) CJ 5's. With the abundance of tubes, here at this sight /Also since we're not talking expensive "nos"s/ why would one want to mix & match? I would say no harm for a short period of time (less than a week). Amps are expensive to work on / why take a risk?--Not to mention the affect on the sonic integrity.Keep spares on hand that are the same.
Tubes: unmatched Quads or Pairs
If you own an amp that has individual bias controls, what is the worse thing that can happen if you install a mismatched tube OR say 1 Svetlana with 3 Sovteks?
thanks
thanks