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All I could think of would be that there are bad connections from the leads to the windings or high resistance "almost opens" in the windings, just tenuous stuff. If you clip on your ohmmeter and wiggle the wires going to the primary, do the readings change? Are any windings shorted to the transformer frame?
As a test I'd sub in any push-pull transformer I had around just to see how the output stage worked with it.
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Reece
Perfection is hard to reach with a screwdriver.
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