[morzh]

Certain thing you can even fix without schematic.
Of course it is that much more difficult.

But if all values of resistors and caps are readable you could always see if the resistors check out and what value caps you need for replacements.

Continuity check will take care of coils.

And cleaning and visual inspection will do the rest.

Now, should it be a multy-tube monster like a floor 37-690 I would neither recommend it to anyone nor would I look forward too m,uch to it myself, but this being an AA5 set it cannot be too bad.

Just in case you don't procure the schematic. Of course it will make everything that much simpler.