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MIke, womderfully informative reply!

Posted by Allen Wright (M) on March 12, 2006 at 10:07:26

In Reply to: EI cores and C-cores with dc unbal plate currents posted by mqracing on March 12, 2006 at 09:36:18:

> the best solution would appear to bee keeping the unbal dc plate current potential tightly under guard and not to airgap the transformer greater than necessary<

This I agree with 100% and is the ultmate solution IMO and IME.

I have based my recommendations around my own experience with identical circuits but several brands/types of transformer.

We use Lundahl C cores in out production amps, and they (at least claim to) use a specifically defined airgap set by a plastic spacer inserted between the two "C core" halves, and I can hear no sonic losses when there are up to 4mA unbanced DC between the two halves - but all the EI's I have tried, which range from Dyna ST70' OPTs up to James manufactured top of the line "Tamura"s, have clearly noticable sonic losses with less than 1mA DC imbalance in a very high resoltion system!

I have not had the chance to use any of your OPTs - only becuase I was rather frightened off by the quote you once gave me for the best Peerless design that would have suited...

Allen

PS What are these joke looking dirt track "funny cars" I see being called "World of Outloaws"? Thought they ran real frightening, massive winged sprint cars?

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