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JHGibson · 11th Jul 2006, 4:04 pm

The drive to the 6V6 would really have to be measured by a vacuum valve voltmeter set to AC RMS, or with an oscilloscope. The impedance level at the control grid is high and a AC reading voltmeter like an AVO would load the cicuit badly and give a misleading too low a value.

Lacking this instrmentation, just crank the volume up until the sound out is really loud!
John.

11th Jul 2006, 4:04 pm	#7
JHGibson Retired Dormant Member Join Date: Apr 2003 Location: Salt Spring Island, BC, Canada Posts: 368	Re: Regarding home made TRF The drive to the 6V6 would really have to be measured by a vacuum valve voltmeter set to AC RMS, or with an oscilloscope. The impedance level at the control grid is high and a AC reading voltmeter like an AVO would load the cicuit badly and give a misleading too low a value. Lacking this instrmentation, just crank the volume up until the sound out is really loud! John.