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Philco Seventeener II

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#19

07-05-2017, 11:28 PM

jr_tech

VideoKarma Member

Join Date: Sep 2009

Posts: 4,573

Simply replace the heater drop resistor with a diode... it will clip off half of the 122v sine wave. The resulting true rms voltage of the clipped waveform will be 0.707 times the input voltage. 1N4007 will work fine in this application.

jr

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