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(!!!!) (Best Value Single) 12BH7A RCA EI Yugo smooth plates NOS 1970's (11.5/13.2ma)
(!!!!) (Best Value Single) 6550 Tungsol branded Sylvania smooth gray plate used/tests like new 1960 era (138ma)
(!!!!) (Best Value Single) 6922=E88CC Penta Labs Hungary used/like new 1980 era (13.8/15.8ma)
(!!!!) (Best Value Single) GZ34 Mullard NOS rebranded Tungsram NOS 1972 (54/40 and 60/40)
(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 (.8/1.2mA Gm=1400/1600)
(!!!!) (Good Value 1962) M8137=12AX7S Philips SQ France ribbed plates NOS 1962 (0.8/0.9ma and Gm=1350/1350) (Special Quality 12AX7)
(!!!!) (Good Value Pair) 6SN7GTB GE NOS 1966-1968 (7.4/6.2ma and 7.6/6.8ma) (same Gm)
(!!!!) (Good Value Pair) 6SN7GTB GE used/good 1955 (6.6/6.8ma and 6.6/6.4ma)
(!!!!) (Good Value Pair) 6SN7GTB GE used/good 1956-1957 (7.6/6.8ma and 6.6/7.3ma) (same Gm)
(!!!!) (Good Value Pair) 6SN7GTB GE used/good 1958-1961 (6.4/6.8ma and 6.4/6.6ma)
(!!!!) (Good Value Pair) 6SN7GTB GE used/good 1960-1964 (6.6/6.2ma and 6.2/6.4ma)
(!!!!) (Holland Single) 12AU7 Philips Miniwatt Holland like new 1961 large "O" getter halo (9.6/11ma)
(!!!!) (Pair) 6B4G Raytheon NOS 1940's - 1 tube branded Tungsol - same build - separate plates (82ma and 83ma)
(!!!!) (Pair) 6B4G Raytheon NOS 1940's - 1 tube branded Tungsol - same build - separate plates (86ma and 92ma)
(!!!!) (Recommended Pair) EL34 Philips by Mullard XF2 double halo "O-O" NOS 1965 and single halo "O" 1969 like new (76ma and 80ma)
(!!!!) (Single 1961) 12AU7=ECC82 Mullard BVA UK shield logo NOS 1961 (7.5/9ma) (Gf1 series) (smooth rich sound)
(!!!!) (Single) 6922=E88CC Penta Labs Hungary used/good 1980 era (10/15ma)
(!!!!) (Single) 6922=E88CC Siemens Halske Germany branded RCA gray shield used 1966 (12/9.2ma)
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 very good printing (10.0/10.8ma) (high Gm)
(!!!) (Best Pair) 6203 GE NOS 1976-1979 (53-54/40 and 54-54/40)
