Bias Adjustment

adydula · 732

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Offline adydula

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on: August 27, 2019, 01:07:35 PM
After several months I chceked the bias and both sides were at 149 VDC.
I adjusted a few turns and set them back to the nominal 145 VDC.

So whats this indicating about the tube wear?

Alex



Offline Paul Birkeland

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Reply #1 on: August 27, 2019, 02:19:08 PM
It may indicate burn-in more than anything. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline adydula

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Reply #2 on: August 28, 2019, 04:52:06 AM
I agree....nothing to really be concerned about.

It would be a neat excercise to plot the voltage change over time and see how that looks....

Nah...life is too short!!

Thanks Paul....listening with the Mainline, its superb!

Alex



Offline Raymond P.

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Reply #3 on: August 28, 2019, 05:33:45 AM
The good news is I don't notice any change in sound quality from this bias drift. I'm happy there's the ability to adjust bias though.


Raymond P.