Zenith AM-FM G725 - A825

[DavGoodlin]

These two radios have been collecting dust in my shop for a good reason; both are in great physical condition but have me completely baffled. This is the season when I'm dealing with these handsome stragglers.
G725 A825.jpg
G725/chassis 7G01 plays great on AM, FM hiss only. No oscillator operation, yet 10.7 MC will pass from 12AT7 grid thru IF strip with plenty of gain.

A825/chassis 8T01 has dead AM no noise, hiss FM no oscillation either band.

I have checked voltages and continuity thru band switch and coils. touched up solder joints on slug-tuned osc coil both sets.

I'm sure a component that rarely fails has done so, maybe a pf cap. Normally, these radios respond well to a recap and replacing the selenium rectifier is a must. The worst issue I have seen is the dreaded silver mica disease that plagues some of these big cans more than others. One of the cans was replaced in the lower one, A825.

Am I assuming SMD is not causing osc issues ?