[morzh]

OK, another problem. The Magic eye does not indicate, the sector stays open.
The tube was darkish, so I bought NOS for replacement, a 6e5. Still....so, I looked at it more. The 1MOhm resistor inside the socket is fully open. Shucks!

Any bright idea a to how to open the socket?
The pin 3 is not wired, so I cannot throw a resistor outside the socket.

And I feel cheap/ lazy to buy a new socket, let alone wire it.