(!!!!) (Best Pair 1930's) 30 Sylvania engraved base NOS 1930's (3.2ma and 3.4ma) (same Gm)
(!!!!) (Best Pair) 30 Sylvania NOS 1946 (3.4ma and 3.8ma) (same Gm)
(!!!!) (Best Pair) 429A Western Electric NOS 1978 (47-47/20)
(!!!!) (Best Pair) 429A Western Electric NOS 1978 (47-50/20)
(!!!!) (Best Pair) 429A Western Electric NOS 1978 (51-53/20)
(!!!!) (Best Pair) 6L6G MULLARD UK NOS 1959 (63.5ma and 64.0ma) 1-3% matched
(!!!!) (Best Pair) 6LQ6 RCA gray plate NOS 1970's (84ma and 89ma)
(!!!!) (BEST PAIR) 7027A RCA NOS 1972 (69.2ma and 70.5ma)
(!!!!) (Best Pair) 7189 Sylvania black plates NOS 1970 era (42ma and 46ma)
(!!!!) (Best Pair) 807=ATS25 GEC England black oval plate ceramic base NOS 1940's inspected in 1953 (80ma and 84ma) (1st version of ATS25)
(!!!!) (Best Pair) 811 RCA NOS 1946 (54/36 and 56/36)
(!!!!) (Best Pair) ECL86 Mullard UK NOS 1966-1973 (1.8/1.4ma and 37.2/37ma)
(!!!!) (Best Pair) ECL86=6GW8 Philips Holland NOS 1968 (1.1/1.2ma and 40.5/44ma)
(!!!!) (Best Pair) ECL86=6GW8 Philips Holland NOS dimpled disc getter halos 1968 (1.6/1.7ma and 36/41ma)
(!!!!) (Best Pair) ECL86=6GW8 Siemens Germany NOS 1968-1969 (1.1/1.2ma and 41/46ma)
(!!!!) (Best Pair) GB-6005 Sylvania Gold Brand Gold Pins NOS coated glass 1960's (47ma and 48ma) (best sound)
(!!!!) (BEST PAIR) JAN-6005W GE NOS 1980-1981 (48.5ma and 48.6ma)
(!!!!) (Best Quad) 6KG6A Westinghouse JAPAN NOS original boxes 1973 (132, 133, 138, 140ma)
(!!!!) (Best Quad) 6L6GT=6n3C Russian NOS 1982 in white boxes (68.5/69/69.5/70.5ma)
(!!!!) (Best Quad) 6L6GT=6n3C Russian NOS 1982 in white boxes (72/72/72/73ma)
