If its the socket you can bend in the contacts from the top
with a jewelers screwdriver for a temp repair sometimes.
Works good often for sockets that wont clean.
Some sockets you can also replace one pin to fix.
At the next ham flea market look for a set of test sockets,
they plug in between the tube & chassis & have test points.
And dont forget count CW from bottom, CCW from top.
BTW One of the biggest dogs we had was a vert socket.
Maggy color no vert sweep. Road man tried tube then pulled
chassis. I jigged it & poked at it for days, got nowhere.
2 part time EE's tried & 2 other techs. Finally we gave up, it
beat us. I told the shop idiot to wrap it up to send it to a
Maggy dealer. When he went to put the origional tube back
in the end of a pin was on the tube pin. A new socket fixed it.
73 Zeno
