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Ian Bell[_2_] Ian Bell[_2_] is offline

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Totally Black B9a glass tube

A friend has some 6CG7 tubes that are totally black. They have Tung Sol
JAN written on them and the tube type but other than that they are
completely black. You can't even see the filament glow - and they do
work. Are these some special type of tube?

Cheers

Ian

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