I have a QRO 2500 for which I just ordered some spare tubes. The amp has a separate filament transformer.
I'm wondering if it would be worth it to disconnect the HV supply and run just the filaments to prepare the tube.
Edit: would the amp even turn on if I did this, don't know
Is this even possible with this amp and would it be worth it ?
Any metal ceramic tube has to getter from filament heat. If you are unsure of tube gas, run it several hours with filament AND blower only.