Lewm brings up a very good point when he states that tubes age at different rates. I have always wondered how tube matching makes a lot of sense when a) the tubes will age at different rates b) what are the parameters that one can say a tube is matched to another? c) your circuit is either driving a tube hard or it is not-- which results in varying the life and the point in (a) and lastly d) noise and distortion vary greatly by tube design and placement in the circuit.
Anyone here truly know what a tube tester is accurately testing for?
Anyone here truly know what a tube tester is accurately testing for?