If the pins on the CRT itself are identical (I think this is the case with the compact, Lisa, and Apple 12" monochrome CRTs), couldn't you use the compact's own video circuitry to drive the larger tube? The tube doesn't care about timings and signal polarities, does it? I am literally asking, not challenging any statements anyone has made.

raoulduke: Do with your own toys whatever you want. You run the risk of becoming the neighbor kid from Toy Story if you let it get out of hand.