Need help with Pacific Mercury Model 4321

[Electronic M]

Originally Posted by Tom9589

We had a Hallicrafters model 818 which has a color adapter plug. It had two connections within the set. One was to the plate of the sync separator. The other connection was to the top end of the contrast control in the video amp's cathode circuit.

Here's the real question. How did they change the horizontal frequency and vertical frequency to show the CBS standard picture. I didn't see any mods of deflection circuits that would change those frequencies. Considering that the CBS system had a horizontal frequency of 29,160 Hz, would the typical flyback operate well at that frequency?

As TomC said: probably just a gimmick.

I've read accounts of people retuning the H osc and messing with the vertical to watch experimental CBS color broadcasts on regular monochrome sets. I believe in most sets with strategic RLC time constant switching it can be done.