The Graymavox superheterodyne was designed from information culled from Ric Havyatt's library and other places, I aimed to maintain authenticity as much as possible by using:
The valve lineup: neutralised RF amp., 1st detector, local osc., 1st IF amp., 2nd IF amp., 2nd detector, 1st audio amp and output stage.
To eliminate TPTG instability in the IF stages resistive coupling was used between these two valves. Ric has also constructed one of these and both are good performers. For more information refer HRSA "Radiowaves" July 1998 No. 65 and also 66
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