Testing tubes

[gadget73]

I wouldn't blanket replace the resistors, but checking them is a good idea. You may find a few out of spec, but likely they won't all be bad. I usually give 20% tolerance as an ok range, even though originally its probably 10% per the schematic. Almost all circuits will work fine even at 20%.It might not be optimal, but it ought to receive.

The high pitch whine sounds like oscillation. I'd check the wire routing, and ensure that the volume control itself is good. If its open, it could cause the detector to be unloaded, which will make it oscillate. Also make sure that all tube shields are in place. I don't know anything about this particular radio, but radios designed to use shields or metal tubes will get funny with unshielded glass or missing shields.