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.
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