Pinouts for a Nanao CRT model MG-550CDM?

I have a small (5"?) panel-mount CRT here I'm trying to fire up. The label on the top suggests that it's made by Nanao and is a model MG-550CDM. Google turned up a hit or two, but no real information. The PCB has a 10-pin single-sided edge-connector, visually similar to the style Commodore used on PETs and C-64s. There are two connectors on the back of the chassis - an RCA, clearly NTSC video in, and a 2x3 molex connector, obviously power and perhaps some additional control. This came out of some piece of radio comms gear, if that helps place its context. ground, 5 and 9 appear to be no connect, 8 is NTSC in, 7 seems to be AC in (can't identify AC return...), and 2, 3, 4, and 6 disappear into the bowels of the circuitry. If I'm lucky, there is some sort of industry convention in play here. Does this arrangement ring any bells with anyone? Thanks, -ethan