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Thanks Tom!
Funny you should mention the 1077; I pulled it out last week planning to use it for just the purpose you mention and unfortunately it's got a bad yoke. I suppose I could put it back together and use it just to try to generate H sweep on the Zenith, but it seems like it's probably not worth the hassle if I'm not sure what I'm getting out of there. I wonder if I could borrow the H plate drive from a working TV like a B&W Zenith from the same era.
I think my next step will be to put the HV rectifier socket back in its place, test the boost (great suggestion) and then remove the chassis to test all of the passive components in the section - it's the only part you really can't easily get to when it's stood on its head. Both your explanation of the HO grid bias makes sense, and so does using the boost as a reference for the regulator. Thanks again.
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