First off can you get the pix back by hitting, moving
tuner etc ?? OR once snowy do you have to shut off
& cool down to get it back ? Also is it clean snow like
an OTA fringe station ? Last time this came up here
it was just the external matching transformer !!
The set almost has to have a Zenith SGVG tuner that
is good cause its easy to service. BUT I would NOT change
the RF amp without proof. Too many things can go wrong.
Much more info & trouble shooting are needed first.
73 Zeno
LFOD !