Horizontal Drive waveforms on my 1950 Zenith porthole

[sean]

Mike,

Here are photos of the waveforms I get on my set. These were taken at the grid of the 6BG6:

Drive full CCW

Drive midpoint

Drive full CW

Zoom in of the waveform

The vertical scale is 20V/div. With the drive pot in full CCW I also measured -5Vdc on the 6BG6 grid and 34Vdc on the Hor. discharge plate, full CW I got -7.4Vdc on the 6BG6 grid and 66Vdc on the discharge plate.

And here is a schematic of this set: Zenith 23G24