Question about NeXT 17" B/W monitor

Does anyone know the part number for the CRT in a 17" NeXT monochrome monitor? I've cast about for a schematic that shows it to no avail. I've opened up the monitor (N4000A), and the number is not evident. The internal frame bears a Sony name and number, SMC-311A. I fear the number may be hidden under the yoke - which I'd rather not pull free, for obvious reasons. Before I start getting dramatic with this thing, does anyone know the part number? I'm going to try rejuvenating the CRT, per a comment by Ethan a little while back (I acquired a B&K for $9 on ePay). Nearly all of the 17" CRTs have the same switch settings, but count on Jobs to have picked an off one. :-) So it seems wise to tap the collective wisdom before just crossing my fingers. Thanks -- Ian