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Help I.D. Tube brand w/pic.

gonzomeep

gonzomeep

Super Member
Hello all. I hope you don't tire of my "tube newbi" questions. I just got my MELOS GK-1. It came with quite a few extra tubes. One brand that I cannot I.D. is the one shown. The box reads "Pro/Comm" This is a 6GK5 tube. It aslo reads GT. BRITAIN . I was told that they could be Mullard, dunno. Thank you for the help!
 

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If they are Mullard, they'll have an etched code near the bottom. First line is tube type, second line is plant and date code. Plant code B: Mullard Blackburn plant.
 
I'll be darned, I didn't even see those other small numbers/letters. Top line is "A W", bottom line is "B 3 1" . So they're Mullard's? SWEET! Thank you VERY much Tom Bavis.
 
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