[morzh]

So, I injected 5V into what I think was 5V rectifier filament and I got 520V from the Hi-V winding.
I will check the 2.5V later.

The front has two separate sections, probably 120V (110-120V) and another one which looks the same, a separate winding. I think they are connected as 220-240V so the radio could work if fed 220V input.
I think some wires were looped and wrapped with black tape (I do not see a volt selector).
So I will likely do the same, insulate one half and use another.

I just need to think if I destabilized the tar when freezing-tapping and if I should restabilize it by reheating it to some degree.
Also if I need to fill the void I created with something. Electriclaly it does not affect anything but I am not sure if this might cause some buzzing.