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(!!!!) (Best Value Pair) 6021=CV3986 Mullard UK Whyteleafe plant NOS 1972 original boxes (4.4/7.0ma and 4.8/6.0ma)
(SINGLE) 6021 European NOS 1974 (20 in stock)
6021 probably made by EI Yugoslavia NOS 1970's - 1980's (1 pair)
JG-6021 GE gray plates NOS 1962 (6.4/5.5ma)
