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Yep, what I was trying to get to was confirmation that if a metal cone tube had gone to air a rebuild was less likely to be successful.
In the UK, the metal cone was a short lived solution for larger screens (generally 16"), very soon replaced by all glass 17" designs, so the metal cones are quite rare. Despite being rare, the ended up in lots of console sets that aren't particularly valuable today so the tubes aren't really worth rebuilding. However HMV did an oddball 21" metal cone model and that would definately be worthwhile rebuilding, but if success is unlikely as tube had already gone to air then again not worth trying.
TTFN,
Jon
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