(!!!!) (Recommended Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (54-55/40 and 54-55/40 x 2 tubes)
(!!!!) (Recommended Single) 12AY7 GE NOS 1960's (2.2/2.5ma)
(!!!!) (Recommended used pair) 5881 Tungsol used/good 1960's (63.2ma and 66ma)
(!!!!) (Tungsol Single) JAN-12AY7 Tungsol like new 1960 era (2.9/2.7ma) (same Gm)
(!!!!) 5U4G GE NOS 1952 (55/40 and 51/40)
(!!!!) 6336A Tungsol branded Heintz and Kaufman 1960's (62/76ma) ***
(!!!!) 6AK5 GE NOS 1973 (10.2ma)
(!!!) (2nd Best Single) 27=127 Arcturus Blue Balloon tests like new 1930 era in white box (4.5ma)
(!!!) (Best Pair) 35W4 Tungsol NOS 1960 era (54/40 x 2 tubes)
(!!!) (Best Pair) 5881 Tungsol rebranded Sylvania and GE 1960 era used/test like new (77.3ma and 74.5ma) (close Gm)
(!!!) (BEST PAIR) 5998A Sylvania JAN NOS 1980 (115/114ma and 116/114ma) (5998A=7236) 1-3% matched
(!!!) (BEST PAIR) 5998A Sylvania JAN NOS 1980 (122/127ma and 123/126ma) (5998A=7236)
(!!!) (BEST PAIR) 5998A Sylvania JAN NOS 1980 (124/126ma and 126/122ma) (5998A=7236)
(!!!) (BEST PAIR) 5998A Sylvania JAN NOS 1980 (136/132ma and 134/132ma) (5998A=7236)
(!!!) (BEST PAIR) 6A3 Tungsol coated glass NOS 1940's (64ma and 65ma)
(!!!) (Best Pair) 6BX7GT GE "D" getter NOS 1954-1956 - 1 tube branded Raytheon (53ma/50ma and 47/52ma)
(!!!) (Best Pair) JAN-6384 Tungsol used/test like new 1967-1972 (68.5ma and 66ma)
(!!!) (BEST PRICE) 80 US Brands used/good (5 in stock) ($9.99 each)
(!!!) (Best Single #1) 12AY7 GE NOS rebranded Raytheon 1960's (2.8/2.5ma)
(!!!) (Best Single 1950's) 5687 Tungsol black plates "U" getter used/tests like new 1950's (36/39ma)
