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Re: what's the application?

it is not possible to wound this bifilar, this gives a very high capacitance between both windings, much to high for the high plate resistance of your tubes. And you get an very high coupling capacitance, you can also use an coupling capacitor. The next fact is the stray inductance is proportional to the main inductance, and high stray inductance is reducing the high frequency response.

And permalloy will loose its magnetic characteristics if you have any DC magnetisation. The warm up time is critical, because different plate current in both tubes.

gerd

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