Attempting first project - Some questions if I may

[zeno]

The on/off switch on these just have 2 wires going to the rear
of the on/off/vc you can hook the two wires together & prove
the switch good or bad.

Now look at how the main chassis is built. Terminal strips soldered
onto the steel chassis.
The ends are soldered, sometimes they are soldered along the strip &
and at most tube sockets.
Those are used as common ground often. They do loosen up
especially on certain chassis & cause int problems. This chassis wasnt
known for it BUT it can happen. If you probe at them with a screw driver
& they show a break resolder them.

BTW this set has a simple SPST switch. Many others had gang switches
with as many as 4 switches & 2 pots. Maggy & Admiral come to mind.
Sometimes the switches were NO & NC. "Jumping" them out can
get much more complex.

73 Zeno