Find out ahead of time how to bias the particular amp you're looking at buying - they are all different.
Some auto bias, so it's a total non issue for the owner.
I have a Rogue Zeus, which has a LOT of tubes. Rogue puts a meter right on top, built in. You just flick a switch for the tube you want to check, and adjust. It's that easy. Rogue might do this on all of their amps, I'm not a dealer - I don't know.
In my mind there are some advantages of being able to check bias - you should let the tubes warm up for a while before checking - auto bias checks them at the power up cycle. Also, you can check tubes periodically, and see if one changes faster than the others, and is on the way out.
I use my amp daily, and need to adjust them every 4 -6 weeks - but not by much. You feel like you are giving the thing a tune up - which I guess you are!
Some auto bias, so it's a total non issue for the owner.
I have a Rogue Zeus, which has a LOT of tubes. Rogue puts a meter right on top, built in. You just flick a switch for the tube you want to check, and adjust. It's that easy. Rogue might do this on all of their amps, I'm not a dealer - I don't know.
In my mind there are some advantages of being able to check bias - you should let the tubes warm up for a while before checking - auto bias checks them at the power up cycle. Also, you can check tubes periodically, and see if one changes faster than the others, and is on the way out.
I use my amp daily, and need to adjust them every 4 -6 weeks - but not by much. You feel like you are giving the thing a tune up - which I guess you are!