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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Valvo Codes posted by Mr.Hate on February 8, 2007 at 03:54:39:
The way it works is like this.The top line, k62, stands for the tube type, k6=ECC82, and the 2 is the is the change code=minor changes in tube.
The second line is the plant where it was made and the year/month.
D=Valvo, Hamburg. The 9 we have to assume means 1959 as before the mid 50's they only had 2 character codes and I doubt it was made in 1969. The L=December. Jan. is A, Feb. is B and so on.The problem is GF dosen't equal ecc82 but instead indicates a CV131 which is a pentode. So look again and understand capitol letters matter and sometimes it is a symbol and not a letter. Also the 12au7 was offered under about 20 different numbers which makes it even harder.
Brent Jessee's web site has a link to tube codes and a short article on how to decipher. Perhaps someone else will have a better guess on what the first two tube codes relate to. Does the tube have any other number on it besides ecc82? Maybe a CVxxxx number or a Mxxxx.
Russ
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Follow Ups
- Re: Valvo Codes - Russ57 08:07:23 02/08/07 (2)
- Re: Valvo Codes - Jeff A W 08:28:49 02/08/07 (1)
- Thanks, Gf is missing on my list(nt) - Russ57 08:38:33 02/08/07 (0)
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