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In Reply to: RE: Issue with tube bias drift in my integrated amplifier! posted by dandaroy on December 05, 2021 at 11:59:02
I suspect the AC line voltage is fluctuating and causing bias to drift. Not a lot you can do about it, but try and measure it to confirm.
Follow Ups:
Can a better power conditioner or one of those regenerators help any?
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I. Dandaroy
If the bias varies plus or minus 10-20% over the course of a day, it won't really affect how the amplifier sounds, provided that all tubes vary equally, which they will unless something is defective. Bias being an exact value isn't that critical, it is more critical that all the tubes are the same.
Edits: 12/06/21
I agree with the other responder, it's probably variations on the AC power line.
A conditioner filters out noise on the line, but does not regulate voltage.
A regenerator is regulated, and will maintain a constant output voltage. There are other types of AC voltage regulators as well.
I have to agree with the simple fact that voltage does vary throughout the day depending on the load out of your control. For years now I have used several APC power conditioners that input whatever the grid is offering that day then convert it to DC and convert it back to a well regulated AC. I have a very steady 120 volts at a very precise 60Hz going to the equipment. I have a Bob Latino ST-70 with all the upgrades that I admit that I check about every two months and the bias just does not drift. APC has done a very good job with their Pure Sine Wave UPS systems. They work well.
I did this out of frustration after talking with an electrical engineer working in our locale for the power company. He just waved his arms out and said, "You didn't hear it from me but what comes off the grid is garbage and variable. If you have delicate electronics of any kind do something to protect them!"
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I. Dandaroy
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