Tube Biasing ?

Kitch , Have you noticed any sonic difference after calibration ?

Bruce : Crossover distortion would be considered a symptom of an (possibly) under biased tube ? Have you experienced crossover distortion ? What would one listen for if this was occuring slightly ?
In the best of your estimation , is the only effects of a slightly over biased tube excess heat and shorter life , or is there another obvious sign to look or listen for as an indicator without putting a meter on the circuit .

How often should bias be checked ?

Kitch , Upon checking bias how much has the voltage strayed on your broke in tubes ?

KITCH , You sound like you've been around the block too , not being talked into the kings new wardrobe . Thank you all for the input with no loss of output and no distortion .