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(!!!) (Recommended Single) EZ81=6CA4 RFT East Germany NOS 1970's faded printing (50/40 and 50/40)
(!!!) (Single) 6V4=EZ80 RFT East Germany branded Funkwerk "W" used/good 1970's (47-48/40)
(!!) (Best Value Pair) 6JC6A Raytheon Japan NOS 1970's same build (9ma and 9ma) (High Gm)
(!!) (Recommended Pair) 6LF6 JAPAN Big Bottle Euro style construction NOS 1970's (92ma and 87ma)
(!) (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)
(!) EZ80 Mullard UK "D" getter used/good 1960 (63/40 and 64/40)
(!) EZ80 Philips Miniwatt France used/tests like new 1961 (63/40 and 64/40)
(!) EZ80=6V4 Tungsram Hungary NOS 1960's (58/40 and 60/40)
6CA4 RCA branded Super Airline NOS 1960 era (54/40 and 54/40)
6JC6A GE used/like new 1960's (10.5ma)
6JC6A GE Zenith NOS 1972 (10.5ma)
6JC6A Raytheon Japan NOS 1960's (16.0ma) (High Ma and Gm)
6JC6A RCA NOS 1972 (18.8ma)
6JC6A Sylvania NOS 1970's (9.6ma)
6JC6A Sylvania used/good 1970's (9ma)
6LF6 GE Lindal NOS 1960's (102ma)
6LF6 GE Lindal NOS 1960's (89ma)
6LF6 RCA JAPAN branded Gt. Britain Big Bottle Euro style construction low hours/like new 1976 (104ma)
6LF6 RCA JAPAN branded Gt. Britain Big Bottle Euro style construction NOS 1970's (80ma)