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I've never seen that model. Wow.
We sold a few of the Trans Vistas from 69-71. Schematically, they're very close to the XL-100 which replaced them in late 1971. The Trans Vistas were pricey and most likely prototypes to see how they would hold up in the field. None of the ones we sold ever came back for service that I can recall. With the XL-100, RCA went all in with solid state with the XL being a partly modular TV to improve serviceability. RCA did continue to sell some hybrids along side the XL-100 that used sweep tubes, and those were also ridiculously reliable and had a great picture.
IIRC, the first Trans Vista used a HV rectifier tube and the later ones used a SS tripler or quadrupler.
Regarding the battery, if it's a single cell, I wonder if it's a 4V mercury battery. RCA used to use those in the early 60s small transistor radios.
John
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