Restoration Fluke 8300A
Problem1: Last Nixie off.
Problem2: Power switch always ON
Scope pics: 1 = working Transistor, 2 = fail transistor, tested at C (= Anode Nixie)
tested with Tek221, isolated ground free
Found a bad Transistor going to Anode of the non working Nixi, swapped to BF421 = OK
But the Nixi self seems to be defektive, the zero is mostly on and it fires multiple numbers, looks like a mechanical defekt inside, shorted plates.
Displaying of 0 is allready, other numbers NOT.
I have to look to buy a spare.
greetings
Martin