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Hummmmmm-POP!? ..... I bet it's a 40, and the SCRs in the power supply are shorted. I can remember seeing a few 40s with virtually no markings indicating they were solid state. The early ones said New Vista Color, and maybe had a little tiny logo next to the Nipper & Gramophone logo that was a schematic symbol of a transistor. Naturally it could also be a 38 with blown B+ diodes, resulting from leaky filters, or I think I've seen a shorted degaussing thermistor cause that in an RCA.
Nice set, and you don't see those so much anymore.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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