More About Transformers.(Brief Article)

Q Your September column stated that the transformer winding with the highest resistance is the primary. That is not necessarily true for those of us still hanging on to our vacuum-tube gear! Windings that deliver 300 or 400 volts are common, and they have proportionally more resistance than the 120-volt primary.--Greg Cravener, Antique Electronic Supply, Tempe, AZ Further to your June column, your reader may he more familiar with the term "megger" (insulation tester) to test the secondary isolation on his transformers.

He can visit any electric motor shop to have ...

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