I recived a Lowrance Fish Lo-K-Tor "Little Green Box" model 505B from a
friend. I believe it is a 1960s or 1970s vintage fish finder although I
know very little about these. It appears to work, the disk spins, but the
flasher bulb is broken. It appears to be neon bulb about 1 inch long. I
was told by someone that it probably operates at 600V. I did a search on
DigiKey and so no good replacement. I have also searched for schematics on
these fish finders on Google and found nothing. Does anyone know any
details about these bulbs? What operating voltage? Are there any
practical replacements?

Any insight would be greatly appreciated.

- Rob