Let's try this again. The scope is on channel B with the vertical set at 2 volts/cm. The sweep time is set at .5 us/calibrate, and I pulled out the 5x mag knob.
I scrounged up my digital SW receiver and got a nice clear tone at 3586 kilohertz when I held the antenna near L42. The tone disappeared when I turned off the TV. I do have a frequency counter somewhere out in the garage, but I don't trust its accuracy more than the digital radio.
The oscillator is running with the new L42. It's running with new everything, except for the tube socket and the quadrature transformer.
If the oscillator is indeed running, that feels like progress. Time to call it a night; I can try some more things tomorrow.
Phil Nelson