[RGK20m3]

I connected my oscilloscope to the grid of the magnetic tuning amp and was able to easily peak the 77  trimmer for maximum signal (this with signal generator with a medium signal at 1000kc). I then removed the 6H6 discriminator and installed a dummy tube base with leads on the plate pins, to which I then connected the oscilloscope. I was able to easily trim 85A and 85B for maximum signal, also found that 77 could be trimmed better (it had peaked at a different setting due to the scope lead capacitance).
Magnetic tuning still doesn’t seem to function. I am suspecting that the 6H6 May be bad, although it shows good on my emissions tester. When first tested, heaters did not work; but when I measured heater resistance at 7ohms, I reinstalled it in the tester and it checked good. An original Philco tube....
Next step is to remove chassis and measure voltage across the AFC kill switch.