Quote:
Originally Posted by zeno
Robb is correct. I used to tell Jr. techs about "good snow" &
"bad snow". You can tell a lot by how the snow looks. Streaky or
weak snow is bad. Lack of snow is worse. Nice sharp snow & a
nice waterfall in the audio is a beautiful thing. If you have a
good snow picture you will almost always get a very nice picture.
You may get a snowy pix but a new RF amp or mixer/osc will
take care of that. Kind of strange since most of the snow is
noise that is generated inside the TV............
73 Zeno 
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Sets with more I.F. stages will produce more snow. I have noticed that 1940s sets, especially the lower end models will even when working correctly not produce much if any snow on unoccupied channels.