Rivieraranch
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Here are the members of my 12AT7 family
6829 – GE red print
7062 (E180CC) Beckman (Holland)
12AT7 – Sylvania 1950's black plate double mica tube, no print, tests strong.
12AT7 – Sylvania black plate, green print dated 1953 in Sylvania sleeve black plate white print also 1953 date codes.
12AT7 – JHS Sylvania 1952 black plate, double mica spacers; strong.
12AT7 – JHS Sylvania black plate, double mica faint 1954 date code still visible.
12AT7 – JHS Sylvania 1955 date code, black plates, triple mica; pristine, in Collins Radio box.
12AT7WA – Sylvania JHS dated 1957 green print, gray plate triple mica, square getter, military boxes.
12AT7WA – Sylvania with Tektronix labels, green Sylvania print, gray plates, triple mica, matching 1959 date codes, pristine condition, UNUSED. Tektronix hand selected and tested only the finest tubes for its scopes.
12AT7WA – Sylvania USAF gold print, triple mica air force tubes which had to withstand high altitude and extreme shock; in clean military boxes turning slightly brown with age.
12AT7WA – Sylvania-made for Sperry Gyroscope, packaged June 1956, triple mica, black plates; NOS and high testing.
12AT7WA – Sylvania JHS triple-mica black plate military tubes in white boxes marked Philco Corp., packaged May 1956; tubes have 1955 date codes.
12AT7WC - JAN Phillips tubes with 1987 date codes, LIGHT USE in JAN boxes.
6201 (12AT7) – Mullard manufactured 12AT7 gold pin tubes, in red, white and blue boxes.
CV4024/12AT7WA - Mullard military manufacture with white boxes, cardboard liner, tissue paper and pin protectors.
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