View Single Post
Old 3rd Oct 2019, 12:24 am   #13
Maarten
Dekatron
 
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,185
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.
Maarten is offline