[Greg]

Just some thoughts...

Did you try the counter on a working band or just the non-working bands? If it's going to work at all it seems like it should work on a working band. So I'd test it there first.

Otherwise, I never did this but, I might consider using an RF signal generator as a stand in for the oscillator. That's assuming the oscillator isn't working.

Comments anybody? Would either of these work?

1) A somewhat "indirect approach". I would try wrapping a wire around the 6L6 mixer and connecting it to the generator.

2) Or a more "direct" approach. Looks like pin 5 of the 6L6 is the oscillator input to the mixer. I would  connect the signal generator to pin 5 through a smallish capacitor and see what happens as I tune in the range of the band of interest.

In either case, tuning the signal generator should tune the radio.

You're probably most likely to hear something on band 3, 4-7 MHz.

You could also have a bad antenna or oscillator coil in these bands OR simply dirty band switches?