[codefox1]

Assume nothing. Please post the schematic you are working with, or at least a link to it. There may be one capacitor wired just the opposite to supply a bias on the output circuit. I am not familiar with this set, but since it has a power transformer, logically all the smoothing capacitors would usually return their negative to the chassis ground. This is not always 100% true, so please wait until someone else chimes in. You will have a little time on your hands anyway digging out the tar and foil and crap from that can before you stuff it with modern components. There's little to no chance that those components are any good or safe after all those decades. Proceed with caution. And all that garbage you do dig out is pretty nasty, so do a proper disposal and cleanup of yourself and your bench.

Keep us posted.