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Phil,
The 1.5v you mention is likely a DC bias voltage, not a P-P video signal. Experiment with it, try negative and positive going video to see which it likes more. You may need a higher amplitude signal at that point for it to properly pick up, I've had varying degrees of success with different sets in the past when doing this. For example, the 52T-1634 Philco I had as my first set made a dazzling monochrome picture with nothing more than normal composite output from just about any source. Color sets less so, they tend to need a stronger signal hence the amplifier to boost it up a bit.
You say it works 'reasonably well' right now, what exactly is keeping you from giving it the ole siskel and ebert? I ask because there's a good chance that what's keeping it from being outstanding now will likely still keep it from performing it's best later, so why not get it where it should be first then try injecting video? My experience has always been that small problems become bigger ones post modification, and become harder to trace down. Only exception of course being tuner/IF troubles, I eliminate a lot of problems by bypassing that early in a resto.
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Evolution...
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