Quote:
Originally Posted by Reece
The BFO in the AR-3 is a reflex circuit using the triode of the 12AV6 first audio. I think Heath used the 12A6 output in those days as they had scooped up good deals on surplus WWII tubes. Mine still has the original 12A6 in it.
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Heath used that tube, in just about everything. Signal tracers, small hi-fi amps and as a rectifier in a few of their kits.
They had their power transformers wound with a 12 volt heater winding, to use that tube and a few other war surplus tubes.
10-22-2014, 10:17 AM
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