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(!!!) (Best Single) EZ81=6CA4 RFT East Germany NOS 1970's (49/40 and 49/40)
(!!!) (Best Single) EZ81=6CA4 RFT East Germany NOS 1970's (49/40 and 50/40)
(!!!) (Best Single) EZ81=6CA4 RFT East Germany NOS 1970's (50/40 and 50/40)
(!!!) (Best Value Single) EZ81=6CA4 Sonotone USA branded Westinghouse NOS 1961 (54/40 and 56/40)
(!!!) (Recommended Single) EZ81=6CA4 RFT East Germany NOS 1970's faded printing (50/40 and 50/40)
(!!!) 6CA4=EZ81 GE NOS 1980 (55/40 and 55/40)
(!!) (Best Pair) 6CA4 Tungsol branded RAD TEL NOS 1961 (52/40 and 52/40 x 2 tubes) 1% matched
(!!) (BEST VALUE SINGLE) 6CA4 RCA branded Tungsol NOS 1960's slightly tilted glass and top mica (52/40 and 52/40)
(!) (BEST PAIR) 6CA4 RCA NOS 1960's - 1972 (54-56/40 and 54-54/40) (Wright, Counterpoint, Cary, Zanden)
(!) (BEST PAIR) 6CA4=EZ81 Sylvania NOS 1960's (53-54/40 and 52-53/40)
6CA4 GE branded Tungsol like new 1960's (55/40 and 56/40)
6CA4 Philco by Sylvania NOS 1960's (52/40 and 52/40)
6CA4 RCA branded Super Airline NOS 1960 era (54/40 and 54/40)
6CA4 RCA NOS 1961-1962 (50/40 and 50/40)
6CA4 Silvertone by Sylvania NOS 1960 era (54/40 and 54/40)
6CA4 Sylvania NOS 1960 era (54/40 and 54/40)
6CA4 Sylvania NOS 1960's (52/40 and 53/40)
6CA4=EZ81 RCA used/good 1962 (53/40 and 53/40)
6CA4=EZ81 Sylvania used/good 1960's (53/40 and 53/40)
EZ81 Mullard UK "D" getter used/tests like new 1960-1962 era (56/40 and 57/40)
