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Some red glow on the plate is normal for transmitter tubes like the 833, I can remember what these look like when adjusting modulator current. The filaments on these tubes also glow brighter than regular receiving tubes.
However if there is a glow on the plates of tubes in a TV set this indicates abnormally high current draw. I can't imagine though that the plates would be glowing when the set is off (in standby), only the filament should be glowing.
Can you snap some pictures of the tubes?
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