Originally Posted by
Jazid
There are people around with curve tracers which is what you need rather than a single operating point type of measurement like most valve testers produce. Henry (toprepairman on the old 'Wam) has one and I'd be surprised if Graeme at Amp Regen can't test them thoroughly as well.
Is the amp safe with the old power valves? Maybe, Primaluna claim not to run the valves hard, but the arcing is likely caused by too high anode voltage. I suspect it is also likely to have affected one power valve rather than all of them. So the valve might still behave OK, or could be flaky and dangerous, or it could work fine but just with a bit of added distortion/non-linearity. That's what the tests are for.
To my mind it seems unwise to leave the amp exposed to possible damage for the cost of a bunch of relatively cheap cooking tubes to tide you over whilst you get the valves checked...
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