[morzh]

I am not sure they used lytics either, and from what I read, Mershons, when they appeared, were used on hi-end radios. Wide use of them came in 40-s, not in beg 30-s.
But why the heck do they show "+" signs on 3 out of 4 filter caps? Both in the sch and in the can layout?

BTW what are the voltage ratings of the filter caps / bakelite potted caps? Or should I start making educated guesses? I think for the filter 600V is a good number for the two in the LC filter. The one across the choke can be 50V (I think 20-30V is the dropout) but I would use a 100V, and the one across the multi-tap resistor needs to be at least 300V (150V dropout), so might as well make it the same 600V as the other two.

Yes, I will replace them. I just want to get the reception working properly, and not the way it is now - loud and clear when I touch the plates or remove the screen.(I think one tube is bad and hence my reception problems, and I even know which one is bad, by swapping them around).
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So, who knows what is the reference point of the voltage measurement? I would assume GND (chassis) but then some things I cannot explain or understand (like the 8V at a cathode tied to the Chassis etc).