1Ж42А. As a mixer/Frequency changer????

[Murphyv310]

As a suggested method if you wanted to construct a sensitive infinite impedance detector for the radio using those valves, could you use a floating supply for the filament? A separate LT cell for each valve wouldn't be a hardship...

I can't see how that does anything much as the filaments are the cathodes and the input impedance is much higher than regular valves.

Well, as an infinite impedance detector, you'd get good linearity and low distortion. I think it's a good suggestion, probably not one often seen because of the extra, floating, battery. But on the experimenter's bench, anything is possible!

I'd try anything to improve the overall performance, to be fair it actually works well and is very much a usable radio even as it stands. It works far far better than any other regen TRF I've ever made, to receive what it does with a ferrite rod aerial is amazing even with no reaction it pulls in the BBC feeds from Westerglen that is 28 crow flying miles from my QTH. Even BBC Ulster can be heard without reaction, not useable though.