The snow test is great. Wish everyone knew it.
Anyhows your snow is there BUT its streaky.
For now try the AGC & or fringe lock controls.
After that check the IF, AGC & tuner tubes. A tester
may or may not show a bad one. Just cant trust testers.
Next step is voltages. After that ingecting with an anylist
is fastest.
73 Zeno
LFOD !