[Arran]

Peter;
Too bad that your Siemens radio decided not to co-operate for the video, I hope that it's something simple like a dry solder joint and not a corroded winding in a coil. Did you get this set, and the Lorenz from Germany, or another Western country, or did they find their way to Ukraine after the war? I have a feeling that the circuit choices they made were to avoid paying patent royalties, Philco also did this with sets like the model 89, and 70 using an "Autodyne" local oscillator, sometimes they work, and other times they just will not.
The British liked making four tube superheterodynes, called "Short Superhets" where they would skip using a first audio tube, and feed audio directly from the detector into the power output tube, Arvin metal radios kept the first audio stage but skipped the IF amplifier tube, using regeneration on the first detector/frequency convertor for more gain. Basically these are all "city radios", not really meant for long distance reception.
Regards
Arran