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My tube appears to have odd rings around the face of the tube.
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This is probably ion burn, I have seen the 5" model working, I reckon two thirds of the tube face had ion burn, but still displayed a watchable image, if a bit dull.
I think you have been very fortunate with this set, it does look remarkably untouched.
Hopefully the TV section has had little use, as there was only a couple of hours a day of broadcasting, and of course the transmitter was shut down at the outbreak of war.
I suspect the radio has seen the most use, it would be very interesting to test the valves, this would give a rough idea of how much use the set has seen in TV mode.
Mark