(!!) (Best Mullard Pair) EZ80=6V4 Mullard La Radiotechnique Chartres plant France NOS "O" getter halo 1970 (63-64/40 x 2 tubes) 1% matched
(!!) (BEST VALUE) GZ34 Mullard rebranded Sylvania used/like new 1969 (58/40 and 60/40)
(!!) (Good Value Single) 6201=12AT7 Valvo Germany rebranded Philips SQ 1970 (6.8/7.8mA)
(!!) (Good Value) 12AT7=ECC81 Siemens Halske Germany NOS 1970 (10.3/11.0ma)
(!!) (Recommended Single) 12AT7=ECC81 Mullard shield logo NOS 1970 (8.0/8.4ma)
(!!) (Recommended Single) 12AU7A RCA top getter NOS 1970 era (10.2/11ma)
(!!) (Recommended Single) 5881 GE Canada NOS 1970 (73ma) (same build as Tungsol)
(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=1600/1700 and
(!!) (SINGLE 1953) 12BH7 GE NOS gray oval plates "U" getter 1953 NOS (9/12ma)
(!!) (Single) PCC88=7DJ8 Philips Holland 1973 (9.5/10.6ma)
(!!) 12AU7A CBS black plates NOS 1960 era (9.5/11.8ma)
(!!) 5751 GE 5 Star used/good 1970 (1.6/1.7ma)
(!!) 5U4GB RCA NOS 1970 some white oxide flakes inside tube (55/40 and 55/40)
(!) (BEST PAIR) 6CA4 RCA NOS 1960's - 1972 (54-56/40 and 54-54/40) (Wright, Counterpoint, Cary, Zanden)
(!) (Best Toshiba Single) 12AX7 Toshiba Lindal Japan NOS 1960's (Gm=1800/1800)
(!) (Good Value) ECC83=12AX7 Siemens Halske Germany used/good 1960's in white box (Gm=1500/1700)
(!) (Recommended Single) 6EU7 RCA NOS 1970's (51/32 and 60/32)
(!) (Recommended Single) 6GM8=ECC86 SIEMENS HOLLAND NOS 1970 (4.0/5.0ma)
(!) 448A Western Electric smooth top used/good "D" getter halo 1963-1970 (1 pair: 35ma and 36.5ma) (Matched on Amplitrex)
