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

[Amie]

Just one question though, I've seen diodes used as in Trevor's diagram occasionally, But what is its purpose? Is it acting as a clamp?

(There is no DC continuity at its anode so is therefore just floating?)

No, I've never seen a single diode in an official circuit like that, because as you say there is no obvious DC path anywhere on the cathode or anode. Though I can imagine theories to explain why it works, as outlined earlier.

.... Just wondering, I know that it does work, after a fashion, I had the experience with the Grundig 80U where the two FM discriminator diodes were missing removing any DC continuity from the AM detector.... Yet it still worked on AM, after a fashion as I said.

Amie.