They were not C64 monitors....the C64 (and other computers of that era like the Atari 8-bit series) put out Composite video. The 1084 were used during the Atari ST and Amiga period, those put out RGB

Almost all 1084's were Philips (Magnavox) by the way...
Shame no-one seems to remember the Atari SC1224 (Goldstar edition, not the Samsung). MUCH better picture, really dark tube (that was new then)....
