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things I have run into on static/snow
Dirty tuner, if you can get better pic by turning turner just off the channel or any improvement at all while changing channels (can be cleaned)
Weak RF tube in tuner (try wiggling tube in socket look for improvment)
cheap 300/75 ohm transformers for hooking up coax signal (try another)
cheap coax (I prefer the screw on types not the push on cheap stuff)
lighting blown baluns in the tuner (they will looks smoked)
AGC adjustment (if it was fiddled with)
You should resist making adjustments to any of the coils in the set, unless you know what you are doing AND have the right equipment you can really goof things up. About the only adj that you can do by ear is the quadrature coil on gated beam audio detectors. This will help get the buzz out of the audio, but again only applies to gated beam type.
I have read about tuner subbers, you can quickly plub the IF feed from the tv into one and see if the tuner is the issue. I suppose if you had a shop and wanted to check this area that would be a fast way to do it.
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