IIRC its compatible with the tube and yoke of the NOS 17" that popped up recently. I've got the same chassises (chassii?) and tubes and was messing around a while backI found the manual - it's an MGG 15" EQ/2 HR
I was hoping to use it with a tube I recently got from an old Bush tv with a Chungwha tube.
I don't see the regular 4 pin yoke connector on the chassis, so I'm thinking this thing needs a fancy tube?