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RE: Dynaco A470 Output Transformers

Posted by strijw426 (A) on August 17, 2014 at 12:16:58

In Reply to: RE: Dynaco A470 Output Transformers posted by mark.korda@myfairpoint.net on August 17, 2014 at 10:58:45:

Mark;

First, thanks for responding. I get consistent DC resistance measurements from CT to either screen grid on both transformers - about 35 ohms to either screen grid. From CT to plates, one measures about 100 ohms to either plate while the other transformer from CT to either plate measures about 200 ohms. Clearly the plate circuits of the two transformers are widely divergent from one another. I could understand them being perhaps 10% or maybe 20% different from each other, but not one transformer having plate to plate or CT to plate DC resistance twice the value of the other.

What I would like to know is how these compare to some known good working transformers. One of them has to be bad. The question is, which one? Both are OEM transformers never having been changed.

Could you measure DC resistance plate to plate on your unit and let me know the approximate measurement?

Thanks in advance.

Joe

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