Premier Radio 3 valve TRF receiver.

[BusyBee]

I have just taken another look at the Midgetronic. Thanks for your helpful hints Geordie. From the diode onward I have no issues, but I find the RF stage confusing too. The volume control looks like a combination of input attenuator and cathode RF gain. In my view the coils used in this set may well make all the difference. In my circuit so far I have used manual RF gain on the cathode, but I don't think I would try to combine with anything else. Currently with my work I have now constructed a variable frequency RF stage and coupled it to one section of a 3 gang variable capacitor. I have tried it with my RF stage and detector and got useable results over most of the medium wave with several good listenable signals. It currently tunes between about 590 and 950 kHz. My next step is to see if I can get input and amplifier tracking together.

Tracy