If you don't mind opening the thing up, would you let us know if there's a part number on the CRT.   It would be interesting to find out if it's using one of the CRTs that is compatible with compact Macs.

I found a trove (5) of new 9" CRTs some years ago which were replacement parts for 9" B&W Panasonic Security Monitors.  The part number on the CRT was identical to the HRmumble number for the compact Macs and they included a driver board with many components identical to a compact Mac's analog board.

Anyway, it would be especially interesting if the CRT in these was a brand new replacment for the CRT in Compact Macs.  Especially good for those units with burn in and such.