Well, so far Q200 and Q201 on the analog video board, did turn out to be a TO-66 single diffused 4 Amp / 60 Volt complementary pair. They were fairly well matched in terms of hfe, at 99 for the NPN and 67 for the PNP part, at low currents. Both of these older parts seemed to be working and measured OK when off the board. I'll add some MX-4 compound on them when they get resoldered. Maybe I should check the smaller transistors too, as something is making the video garbled. The power resistors seem fine, no burn or overheat spots on the board. I pulled a few of the 10uF. 'Lytic caps but they too seemed healthy, and above their rated values.
While the scan of the Service Manual had put the polarities of Q200 and Q201 in doubt, since I could not see clearly which way the arrows were pointing, at this point, they do not seem to be the problem. The "better than" 8 Amp / 150 volt pair of TO-220 parts, while they would have fit nicely, even onto the original heatsinks, the replacements, it seems were not needed. So its back to square one - again.
Any suggestions?
-Steven