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Bad cap! It's in the supply for the luminance channel which is a flyback-derived supply. A 10uF @ 350v near the FBT comes to mind, or there may be one on the socket board (although I see you checked those). That's great news that the tube seems good!!!!!!!! I've seen too many of those 820DB22s in poor shape. The OSD in that set is the first one which showed not only the channel number, but also the bar graphs for volume, color, tint, etc. Also, the channel display regressively disappears from the bottom up, segment by segment. Kind of cool! Did the schematic come?
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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