When I reconnect the old quadrature transformer (still in place and connected to everything else), the 3.58-mc waveform is visible and I hear a tone
WHEN there is no signal to the receiver.
When I turn on the color bar generator to inject a signal at the 1st video amp, the waveform is flatlined.
I guess the oscillator is capable of running, but something else is killing (or swamping out?) the oscillation when a video signal is present.
For what it's worth, I reviewed my notes of voltage readings in the color circuits. I found wrong voltages on the grids (pins 2 and 7) of V125, the 12BH7, R-Y/G-Y demodulator tube, measuring near zero when those grids should have around -20V (or around -15V according to Sams). At the time I attributed this to the oscillator not running, since the outputs of T115 connect to those grids, but who knows?
Another anomaly at V121B, the 6AZ8 bandpass amp, where the grid should have about -12V and I measured only about -3V or less.
I haven't forgotten the toasted appearance of the old transformer.
Phil Nelson