On Tue, 3 Oct 2017, gregebert wrote:
If all of the numerals in a specific tube are failing, I can think of 2 causes. #1 would be a leak. Check for cracks around the pin base. Are the tubes snug/difficult to insert/remove from the socket ? If so, there could be pin-stress that's breaking the glass-seal.
The only tube failure i've had was from broken seal when I used to rotate tubes, due to stress on pins. I don't rotate them any more.
I was thinking of making an IN-18 adapter board so I can rotate the tubes without stressing the tube pins.
-Dan
