[klondike98]

Yes Terry, I do get a buzz in the speaker when touching the 6F5 grid and if I put an audio tone signal on that grid I get tone from the speaker.

With a second radio I hear the oscillator at around 1050 when the zenith is tuned to about 600.  Moving the zenith tuner back and forth A few hertz changes the sound in the second radio. And that confirms that the broadcast position for the band switch lever is left center.