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In Reply to: RE: Philips SQ 6201/ECC81 question posted by gradEHoser on August 05, 2016 at 13:53:38
You have photos of the Philips Codes at the bottom? Valvo 6201 are one of the best 12AT7 types, IMHO.
Thanks!
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Yes, 2 are code D1L3 and the other D0I2 if that helps at all. What do you make of those codes, i'm interested if you know.
Cheers
D1L3 = Hamburg, Valvo plant. 1961 (or 71). L = December (12th month). 3 = 3rd week.D0I2 = Hamburg. 1960. I = September (9th month). 2 = 2nd week.
What letters are in the second line? This usually is the tube sub-type.
Edits: 08/06/16 08/06/16
Sorry, the other line is D16 on all 3.
What's the tube sub-type all about?
Thanks for the info and link. Cheers
I have "VG" = E81CC. Will need to look into this a but more.
E81CC is a sub-type of the ECC81 (12AT7). AKA: 6201 or 12AT7WA.
Df = 6201. EG: bottom line reads: Df6, not D16.
Edits: 08/06/16 08/07/16
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