Emil

If the switch still sounds good and you hear a crisp snap when the switch closes then the problem might be corrosion around the rivets that connect the solder tab plates to the internal switch contacts.??

Easy to test, just ohm out the switch using the rivets, not the solder tabs.? With the switch closed, if the rivets ohm out as a short then just wire brush the rivets and use an active flux like Nokorode?and solder the rive tops to to the surrounding solder tab plates.??

I once had a Philco cathedral radio with this same problem where the dreaded previous owner had added a toggle switch to the side of the wood cabinet.? I did the above fix and removed the replacement switch then patched the hole in the cabinet with wood filler.? I used a scratch pen to match the color.? Hard to see the repair after the work was done.

Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy