I hate biasing!

Once I get the plastic bias tool into the podemeter adjustment screw the biasing is a snap.  Just can take awhile to get the plastic tool into the relatively small adjustment.  I am typically biasing ever 4 to 6 weeks.

4-6 weeks? Is that normal? Am I being remiss with my (non ARC) amps? I did it once 2 years ago and they’ve been fine since.

Dave Gordon is coming to Dallas for an event next week, a 160M demo. I plan to go and I’ll ask him about the impact of auto-bias on signal path.

amagloic:
Please let us know what he says. He is a pretty straight shooter. 
Long before ARC approved KT 150s for the Ref 150 and while they were house testing for what seemed like a year, I asked him at a show if I could drop them in without worry. He looked me in the eye and said. "Do it. Don't worry."
Of course, I did and he was right.

 I check the bias of my Ref 110 every month or so. But I have not had to adjust the bias in quite a while. They are always spot on. Usually I only have to adjust the bias the first couple times after I install new tubes. After the tubes settle in the bias should not move much. If you tubes are continually drifting, there could be an issue. How many hours are on the tubes? When tubes start getting to the end of there life span, they can start drifting.