IIRC there is a black & a yellow pot near each other. One is
V size the other 90 volt adjust. I THINK the black one is vert
size.
For buzz be sure the tuner is in the right mode ( air & normal AFC ).
If its a light buzz you can try the audio detector coil but be sure you
can go back to the start if it dont help.
BTW I bought one of these new & ran it a few years. They gave an
excellent pix. If your control door isnt broken off its a miracle. They
all did & as careful as I was mine broke.
I am going down Maine friday. When I get back I will see if I got anything on the set.
73 Zeno
LFOD !