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TUBES DISPLAY THE MULLARD CODES J83 B4E1 = 1964 BLACKBURN, U.K.

example:

IX1 B5B4 AND IX1 B5C1
IX = 6ES8 ECC189, 1 = CONSTRUCTION #1
B = Mullard Blackburn, U.K.
5= 1965, B= FEB, 4 = 4TH week
C = MAR, 1= 1ST week