[Chas]

By act up, I mean it squeals and distorts between strong stations. Also, I have a strong station that shows up at multiple different frequencies."

I would look to miss connections, wrong cap/resistor values, shorts between terminals, solder blobs, wire snips, solder flowed between tube wafer contacts, poor riveted joints to chassis, even if the "best ohmmeter" says the joint is O.K. There could be corrosion issues with the coils, if resistance readings are higher, then there is a problem. The band switch must be cleaned with 91% alcohol and gently blown dry, use of "miracle" contact cleaners can result in leakage. Poor connections in the band switch could also be a possibility...

Re-wiring and not following the route of the original wires, especially in the RF/OSC and around the volume control, missing tube shield(s).

Overall, if the "shotgun method" was used to refurbish, that, in of itself, is responsible for the outcome.

It generally takes stage by stage analysis after eliminating a power supply issue if any to recover from cited issues.

Poking the chassis components with a tongue depressor, with set in operation, will often reveal oscillations occurring from juxtaposition.

GL

Chas