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GEC/MOV dating prior to 1969 has always been a bit difficult

WAG.. K = 1954. I have seen "H" stamped K-66 labeled as 1951 issues.

J = 10th month. October.

Not sure what the "10" means. AFAIK, all smoked glass 1950s made KT-66 tube were made at the Hammersmith (Z), Perismith (ZB) or Gateshead (ZA) factories.

These are listed as 1951 made (H). No factory stamp.

photo K-66 1951 H_zpslnsrblw1.jpg

There are 1961 (S). Hammersmith Factory (Z).

photo kt-66 S 1961_zpspfx3zo6o.jpg


Edits: 06/21/16 06/21/16
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