(!!!) (Recommended Pair) 6005W Sylvania JAN black plate clear glass NOS 1971 (45.8ma and 46.6ma)
(!!!) (Recommended Pair) 6005W Sylvania JAN black plate clear glass NOS 1971-1972 (41ma and 41.2ma) 1% matched
(!!!) (Recommended Pair) 6AQ5A Sylvania black plate NOS 1970's (48.5ma and 49.5ma)
(!!!) (Recommended Pair) 6AQ5A Sylvania black plate NOS 1970's (50.5ma and 52ma)
(!!!) (Recommended Pair) ECC85=6AQ8 RCA Heerlen Holland NOS 1968 (21/16.5ma and 18.5/15.5ma) (close Gm)
(!!!) (Recommended Single) CV491=12AU7=ECC82 Brimar England NOS ribbed plates 1974 (9.4/9.2ma)
(!!) (Best Single) 5963=12AU7 RCA NOS 1966 (11/11ma) 1-2% section balance
(!!) (Best Single) JAN-5755 Raytheon Black Plates NOS 1971 (2.3/2.4ma) close triode balance
(!!) (Good Value Pair) 6021=CV3986 Mullard UK Mitcham plant NOS 1971 original boxes (4.8/6.3ma and 4.6/6.5ma)
(!!) (SINGLE) 5963=12AU7 RCA NOS 1965 (10.8/13.2ma)
(!!) (~ Recommended Single ~) 12AT7 Mullard NOS 1971 rebranded "33A/101K" (12.6ma/15.6ma) (Highest Ma and Gm)
(!!) 5963=12AU7 RCA NOS 1963 (9.2/9.6ma)
(!!) 5R4GYB RCA like new 1963 a few oxide filament flakes inside tube slightly tilted glass (50/40 and 52/40)
(!!) 6SN7GTB Sylvania used/75% 1960's (6.0/6.4ma)
(!) 6DJ8 Sylvania NOS 1971 (10.5/14.8ma)
(!) 6DJ8 Sylvania NOS 1972 (14/16ma)
(!) E81CC=12AT7 Siemens double mica NOS 1975 (11.6/13.6ma) (strong Ma and Gm)
(Display Tube) KT66 GEC 1960's (WEAK TUBE: LOW Ma and LOW GM) - for display purposes only
(Display Tube) KT66 GEC 1971 purple gas - for display purposes only
12AT7=E81CC=6201 Siemens triple mica NOS 1971 (12/15.8ma)