Zenith 20CC50 neon bulb replacement.

[Electronic M]

I'm working on a Zenith 20CC50 chassis right now. There are 2 neon bulbs across the HV reg pot (did not study schematic to follow function) one of them had a lead corrode off at the glass (set spent it's life in a damp basement). All I have is the schematic (no parts specs). I was thinking of replacing it with a neon from one of those $2 neon bulb testers electricians use to see if outlets, etc. are live....Will that work?

I have a spare 20DC50 that may or may not have (ought to check later) similar bulbs I can scrounge if needed.