[Electronic M]

Okay that tells us that there is no functional signal path between the grid of the second stage of the 12AU7 osc tube and the yoke which is a problem...Since if we assume the oscillator is working (or is later made to work) in the current state of the circuit any osc. signal there is not able drive the yoke as it should.

Try pin 5 on the output (the grid). This test is supposed to be a signal injection/ substitution test. It uses 6.3V@60Hz from the heaters to approximate the oscillator drive signal (which is assumed to be absent). This signal injection may not yield much deflection, and it will not be synched or linear, but it should let you know if the output stage is working. If there is no deflection achieved from driving the grid of the output tube, then you will want to do the variac vertical output transformer drive test I outlined in a previous post since either the trouble is at the tube or in the transformer/yoke system if grid drive does not yield deflection.

If you have ever trouble shoot a AA5 radio with no reception problems using a RF-AF generator, then you can think of this as the same basic idea only with different signal characteristics.