[R-390] Product det

[Bernie Nicholson]

I have sent the scanned HAM RADIO article to 35 respondents so far ,The circuit works well but I havnt tried the noise limiter mod ,also I have used a 12AU7 double triode prod det circuit and it works even better I mounted it in the 3TF7 socket and substituted 12BA6 tubes fer VFO&BFO this also works well I used a subminiture relay to switch the audio lines it had a 9K coil and I put 22K in series to HT When u switch off the bfo the circuit reverts to the original fer recieving AM , I had a few spare IF modules so I can unmodify it pretty easily, Kind Regards To every one