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(!) (Recommended Pair) 41 GE Canada GT-shape glass NOS 1950 era (74-75/40)
(!) (Recommended Pair) 6JT6A RCA NOS (75ma and 78.5ma)
(!) (Recommended Pair) EL36 Haltron Japan clear top NOS 1960's (86ma and 93ma)
(!) (Recommended Pair) EL95 Haltron East Germany NOS 1970's (20ma and 21.5ma)
(!) (Recommended Single) 5881=6L6WGB GE NOS 1960's (72.5ma)
(!) (Recommended Single) 6BQ5 Tungsol NOS 1960 era (39ma)
(!) (Recommended Single) 8068 GE Hewlett Packard NOS 1968 (42ma)
(!) (Recommended Sylvania Pair) 6BQ5 Sylvania black plate 1960's and 1973 (68ma and 62.5ma) (recommended for FIXED-BIAS amp only due to high current)
(!) (Single) 5933=807W Sylvania double D getters like new 1950 (64ma)
(!) (Single) 6550 Tungsol black plate used/good 1950's (115ma)
(!) (Single) 6550 Tungsol black plate used/good 1950's - guide pin broken off (123ma)
(!) (SINGLE) 6BQ5 Sylvania black plate NOS 1970's (46ma)
(!) (SINGLE) 6BQ5=EL84 Heath Mullard Great Britain used/good 1959 (40ma)
(!) (SINGLE) 6DQ5 Sylvania NOS 1970's (106ma)
(!) (SINGLE) 6JS6C GE NOS 1976 (70ma)
(!) (Single) 6L6G Sylvania branded Raytheon coated glass used/good 1940's (57ma)
(!) (Single) 6L6G Sylvania branded RCA coated glass used/good 1947 (56ma)
(!) (SINGLE) 6L6GB RCA Baldwin gray plate used/good 1959 (65ma)
(!) (Single) 6L6WGB=5881 Sylvania black base NOS 1975 (78.5ma)
(!) (SINGLE) 7027A RCA NOS 1968 (64ma)
