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(!) (Recommended SINGLE) 6U8A Sylvania NOS 1960's (19.8ma/10.6ma)
(!) (Recommended Single) 8068 GE Hewlett Packard NOS 1968 (42ma)
(!) (Recommended Single) PCC88=7DJ8 Tesla NOS 1968 (12.5/15.5ma)
(!) (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)
(!) (SET OF 3) 6SK7 RCA used/good 1940's (7.5ma/7.8ma/7.8ma) (good value)
(!) (Single) 12AV7 Sylvania NOS 1960's (12.4/12.0ma)
(!) (Single) 12AV7 Sylvania NOS 1960's (13.5/14.4ma)
(!) (Single) 12AV7 Sylvania NOS 1960's (16.5/21.2ma)
(!) (Single) 12AZ7A Tungsol gray plates "O" getter halo NOS 1960 era (8.4ma/9.0ma)
(!) (Single) 12SN7GTA RCA black plates NOS 1960's (8.4/8.0ma)
(!) (Single) 37 GE smooth plate NOS 1943 (7.1ma)
(!) (Single) 37 Philco by Sylvania smooth plate tests like new 1940's (8.3ma)
(!) (Single) 37 Silvertone smooth plate used/tests like new 1930's 1 top mica is folded down (7.1ma)
(!) (SINGLE) 417A/5842 LM Ericsson Sweden NOS "O" getter halo 1960's (35ma and Gm=29,700)
(!) (SINGLE) 5692 RCA RED BASE rebranded GL-5692 GE used/good 1949 (8.2/7.6ma)
(!) (Single) 5933=807W Sylvania double D getters like new 1950 (64ma)
(!) (Single) 5963=12AU7 GE NOS 1960's (11.6/11.8ma)
(!) (SINGLE) 5U4GB RCA used/strong 1967 (56/40 and 61/40)
(!) (Single) 6550 Tungsol black plate used/good 1950's (115ma)
(!) (Single) 6550 Tungsol black plate used/good 1950's - guide pin broken off (123ma)
