(!!!!) (Best Pair) 6CA4 RFT East Germany (Funkwerk) NOS 1970's (49-49/40 and 49-50/40)
(!!!!) (Best Pair) 6CA4 RFT East Germany (Funkwerk) NOS 1970's (49-49/40 and 50-50/40)
(!!!!) (Best Pair) 6CA4 RFT East Germany (Funkwerk) NOS 1970's (50/40 and 50/40 x 2 tubes) 1% matched
(!!!!) (Best Single) EZ81=6CA4 Philips Australia NOS 1974 (55/40 and 56/40) (similar sound to EZ81 Holland)
(!!!!) (Best Single) EZ81=6CA4 Philips Australia NOS 1974 (58/40 and 58/40) (similar sound to EZ81 Holland) 1% section balance
(!!!!) (Best Value Quad) EZ81=6CA4 RFT East Germany (Funkwerk) NOS 1970's (1 quad)
(!!!!) (Recommended GE Pair) 6CA4 GE NOS slightly tilted glass 1% matched (55-56/40 x 2 tubes)
(!!!!) (Recommended Pair) 6CA4 GE NOS slightly tilted glass 1% matched (54-54/40 and 54-55/40)
(!!!) (Best Single) EZ81=6CA4 RFT East Germany NOS 1970's (50/40 and 50/40)
(!!!) (Best Value EZ81) EZ81=6CA4 RFT East Germany NOS 1970's (30 in stock)
(!!!) (BEST VALUE PAIR) EZ81 Radiotron NOS made in India 1963
(!!!) (Recommended Pair) 6CA4 Sylvania NOS 1970's (53-54/40 and 54-55/40 x 2 tubes)
(!!!) 6CA4=EZ81 GE NOS 1960's -1970's (52/40 and 54/40)
6CA4 Philco by Sylvania NOS 1960's (52/40 and 52/40)
6CA4 RCA branded Sylvania NOS 1960's (54/40 and 54/40)
6CA4 RCA branded Tungsol NOS 1960's slightly tilted glass and top mica (52/40 and 52/40)
6CA4 Sylvania NOS 1960 era (54/40 and 54/40)
6CA4 Sylvania NOS 1960's (52/40 and 53/40)
