(!!!!!) (Best 5 Star Pair) 6021 GE 5 Star Rated NOS "D" getter halo 1957 in GE 5 Star Boxes (1-3% matched) (6.6/7.3ma and 6.8/7.0ma) (Highest Ma and Gm)
(!!!!!) (BEST PRICE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (0 in stock)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (54/40 and 54/40)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (54/40 and 55/40)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (55/40 and 56/40)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (57/40 and 58/40)
(!!!!!) (Recommended Pair) 6021 GE 5 Star Rated NOS "D" getter halo 1957 in GE 5 Star Boxes (1-3% matched) (5.5/5.8ma and 5.4/5.9ma)
(!!!!!) (Recommended RCA Single) 12AX7A RCA CMI gray ribbed plates NOS 1968 (Gm=1500/1500 and 0.9/1.0ma)
(!!!!!) (Recommended RCA Single) 12AX7A RCA CMI gray ribbed plates NOS 1968 (Gm=1500/1500 and 0.9/1.0ma) (CMI=Chicago Musical Instrument Co.)
(!!!!!) (Recommended RCA Single) 12AX7A RCA CMI gray ribbed plates NOS 1968 (Gm=1500/1600 and 0.9/1.0ma)
(!!!!) (Best Overall Pair) GZ33 Mullard NOS "D" getter halo 1959 (58/40 and 58/40 x 2 tubes)
(!!!!) (Best PAIR for the money) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (52-54/40 x 2 tubes)
(!!!!) (Best RCA Single) 12AU7 RCA tall gray ribbed plates "D" getter NOS mid-1950's (8.8/9.0ma)
(!!!!) (Best Value Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (52-53/40 x 2 tubes)
(!!!!) (Recommended Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (53-54/40 x 2 tubes)
(!!!!) (Recommended pair) EL34 GE and Amperex Holland brown base NOS 1961 (81ma and 85.5ma)
(!!!!) (Recommended Pair) EL34 GE and Amperex Holland brown base NOS 1961 (93ma and 95.2ma)
(!!!!) (Recommended pair) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (best sound) (recommended for Audio Note, Shindo, LAMM) (52-56/40 x 2 tubes)
(!!!) (#1 6BX7GT 1956 Single) 6BX7GT GE "D" getter halo 1956 (45.5/46ma) (1% section balance)
(!!!) (#1 6X4W Tungsol from 1955) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (12 in stock) (best sound)
