dnsey said:Is the frame of the Monitor Black the same as the later types (Red, Silver, Gold) - I can't remember for the moment?
If so, it might be best to pick up a defunct one of these and use the chassis to rebuild the black. I know it wouldn't be absolutely original, but I'd personally prefer that option to a repaired frame.
Most old Tannoys benefit from a strip and rebuild anyway, particularly a good clean of the waveguide, and they're not difficult to do.
The frame, being cast, is unique to this driver.