Should be no problem, but why do it? Unless your bench testing/measuring. But never power up a tube amp without speakers, or resistive load attached, as sometimes they can go into oscillation which can take out the output transformers.
Yes it is. I have not used it about 6 months and would like to install them replacing an Audio Research VS115 Amp. Before doing so, I want it bench tested before even think moving it coz it's massively heavy. I just want to make sure that it powers up.
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