[morzh]

I fixed the quad electrolytic, and after some doubts and misunderstanding of some power-up behavior (well, the tubes are a bit unusual) I connected the antenna, and the thingy sings like a bird, loud and very clear.

There are of course quite a few paper caps; I am not sure all of them need to be changed, only those exposed to high voltages, I will do this later, plus tuning, of course. The way these radios assembled does not inspire changing a lot. Too tight.
The resistors are within except one of a different type, a 2.2M, which I changed (in series with volume pot).

Thanks everyone.