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

[jr_tech]

Originally Posted by vortalexfan

A little update, I hooked up the 1076 to the antenna terminals on the TV and sure enough you were right the first time, Channel 3 pointing up to the 12:00 position was indeed the correct position because as soon as I tuned the tuner to that position the 1076 came in loud and clear, it was just a matter of me having the tuner in the wrong position the whole time.

With ch 3 at the 6:00 position, I suspect that ch 9 was at the 12:00 position, so the tv was actually tuned to ch 9. Ch 9 (186-192 mHz) falls in the range of the third harmonic of ch 3 (60-66 mHz), so is likely that the NES has a much stronger third harmonic output than your other devices, (poorer quality modulater).

jr