robin

amp biasing

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Super Wammer

if your bringing a valve amp that is not auto biasing, you will need to rebias at scalford, my vac pa60 fell from 72ma at home to 60ma at scalford

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Moderator

Sometimes I think I might know a little bit about Hi-Fi and then somebody posts/says something that kicks my "knowledge" into a ditch.

I'll get my coat, thank you :minikev:

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if your bringing a valve amp that is not auto biasing, you will need to rebias at scalford, my vac pa60 fell from 72ma at home to 60ma at scalford

That's a bit strange. Unless something got knocked, I wouldn't expect any change (slightly different mains voltage could have a marginal effect.)

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Super Wammer

these were mono blocks they both read the same drop in m/a :?

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Thanks for the warning - I will keep an eye on my Audioprism's meter.

For what it's worth, I took the amp to Brussels a couple of years ago, and the left channel reading dropped and needed adjustment - when we got back to the UK I had to adjust it again as it was reading too high.

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Super Wammer
Must be mains related then, though I'm surprised it's so unstable. Did both move in the same direction?

yep, GJM graham , was with me when i checked them

- - - Updated - - -

Must be mains related then, though I'm surprised it's so unstable. Did both move in the same direction?

yep, gjm graham was with me when i checked them

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