1950s or '60s vintage Zenith TVs, Need some info

[dieseljeep]

Originally Posted by Kevin Kuehn

But as far as we know both of those boxes were made for the US market? Right now as I'm typing I'm watching my Bugeye through that same Magnavox converter with the RF output set to ch 4. The only issue I have is these Zeniths buzz with text on the picture, which seems pretty common.

Are you aware of the fine tuning control on the back side of the tuner, and also there's a local oscillator adjustment for each channel that's accessible though the little round hole in the upper back side of the tuner?
If you don't have channel 3 or 4 precisely tuned you could potentially pick up all sorts of noise.

I was trying to find a picture of the VHF tuner.
I remember my Zenith set had a tuner that was unusual in a Zenith.
Maybe, just trying another 5U8 would help.