[Mondial]

If your scope has a bandwidth of 20 MHz or greater, you should be able to see the oscillator signal. Take the tube shield off and try wrapping the coil of wire around the 6A8 oscillator tube in the area around the plate as Terry suggested. If you connect your scope probe to the end of the wire, you should see the oscillator signal if you turn up the vertical sensitivity.

Try the broadcast band first as its the lowest frequency and you know its working.