Rca 721ts

[kbmuri]

Originally Posted by Steve McVoy

The proper LO frequencies are:

Ch 2: 81.0
Ch 3: 87.0
Ch 4: 93.0

Yours are all too low. There may be a trimmer that will bring them all up, but, if not, adjust the individual trimmers for each channel.

Your sound will then work fine.

I'm sure that was one of my problems. I set Ch3 to exactly 87.0. Costs me a little picture quality, no sound. Nice to have that section undertood and working though. I set the fine tuning at the middle of its range and set the trimmer at exactly 87.0. So I can tune 1/4 MHz to either side of it.