Don't know the answer either, but would like to ask whether anyone knows whether or not it is ok to immediately play the amp after switching it on? I seem to recall reading somewhere that a tube amp should be allowed to warm up a few minutes before receiving a signal...
A question I suspect reveals a lot of ignorance...
Does the volume at which I listen affect the rate at which my tubes "age"? I'm thinking more volume requires more voltage and higher output voltage levels represent "wear" on the power tubes. Thanks in advance for your tolerance.