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I have four clear glass GEC KT-66 tubes. All are marked KT66 and CV 321. Two of them have the date code "YL Z", one has the date code "TB Z" and one "UE Z".
What is their production dates?
Follow Ups:
From 1969 to about 1983, the date codes are four digits with the first two the year and the second two the month.
So a tube with the code: 8204
= April 1982
Prior to 1969 the they were two digits using letters rather than numbers....the first is the year and second is the month. The months started at A for January, and the year started at A for 1939. The letter to the right of the date code (commonly Z) is the manufactering plant code.
Manufacterer Plant Codes for MO Valve Co./GEC:
L MO Valve Co. (prior to Oct.1951)
P GEC Shaw (prior to Aug.1948)
U MO Valve Co. (prior to Oct.1945)
X MO Valve Co. Springvale (prior to Oct.1951)
Y MO Valve Co. Moray (prior to Apr.1945)
Z MO Valve Co. Hammersmith
ZA MO Valve Co. Gateshead (prior to Mar.1957)
ZB MO Valve Co. Perivale
ZC MO Valve Co. Springvale (prior to Aug.1957)
ZD MO Valve Co. Dover (prior to Dec.1956)
Hope this magic decoder ring helps....
Cheers
YL Z (dual ring-getter) - 1967 Nov
TBZ would be 1962 FEB
UEZ would be 1963 MayThe 2nd letter would be the month and skips I so M would be December.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
Edits: 06/16/12 07/20/12
Thank you, Mike!
P.S. I compared the GEC tubes with Black Treasure KT66 (for the second time) and the latter tubes disappointed me. The amp is NAF Legend-II integrated. The GEC clear glass tubes are very clear, transparent and dynamic, with excellent highs separated from other frequency spectrum, which creates perfect images. The BT tubes are polite, colored and bright, with obvious HF rolloff. Perhaps, they would sound different in another amp.
I really like the Genelex gray glass KT66s and tonight I had a milky one that I cracked open and they are gray plates even tho they are gray glass.The only vintage Genelex tubes I like are the KT66s..I have several near NOS and several NOS/NIB GEN/GEC KT88s and they can't touch my second generation KT90s or the TS 6550 black plates or three holers for that matter.
The reissue KT66s are none too shabby and once broken in give a run to my Genelex clear glass KT66s.I have one quad of c;ear glass GECs.
I cannot understand why the vintage GEN/GEC KT88s sound so dead in the water as compared to even the reissue Gen KT88s.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
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