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Old 2nd Oct 2019, 11:24 pm   #13
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 3,209
Default Re: Bang & Oulfsen 8902

I'm not sure of the correlation between label colour and quality, I suspect the main correlation is between the factory/revision and quality. Just as with normal valves, Philips/Mullard picture tubes have stamped factory codes. Possibly, foreign made Mullard tubes have another label.
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