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Forgive me for raising the most obvious - If it is hooked to an antenna, not cable, VCR, or satellite dish, you will need an analog-to-digital converter box (do you find that some channels have brighter, thicker "snow"and lounder noise on some channels than others?
Next suspects would be the tubes in the tuner and in the IF strip (the little thin tunes in a line on the part of the chassis closest to the tuner).
A whole bunch of other things figure, countless caps, insufficient B+ due to a power supply problem (which could blow your whole project up!), even a video amp tube (can also knock out the sound).
I'm in the same boat as you (just acquired a Zenith roundie myself).
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