(!!!) (Recommended Single) 5751 GE double mica gray plates NOS 1979 (2.4/2.5ma)
(!!!) (Recommended Single) 6336A Tungsol NOS 1960 era (75/80ma) ***
(!!!) (Recommended Single) 6EU7 Mullard UK branded EICO used/like new 1963 (45/32 and 49/32)
(!!!) (Recommended Single) JAN-5751 GE double mica gray plates NOS 1981-1982 (2.3/2.7ma)
(!!!) (Recommended Single) JAN-5814A RCA black plates NOS 1966 (9.8/11.4ma)
(!!!) (Recommended Single) JHS-6005 Sylvania NOS coated glass 1966 (46.5ma)
(!!!) (Single) 12AU7 Philips Australia NOS 1970 era (9.6/84ma) (same internals as Holland made)
(!!!) (Single) ECC81=12AT7 Telefunken Germany <> bottom NOS 1963 (6.8ma/7.6ma) (recommended for mic)
(!!!) (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex)
(!!!) 6336 Chatham metal plates used 1954 (59/74ma)
(!!!) 6336 Chatham metal plates used 1957 (57/53ma)
(!!!) EL34 Mullard Philips Miniwatt XF2 double halo "O-O" NOS 1962 (85.5ma)
(!!) (BEST PAIR) 6EU7 GE NOS 1970-1978 (46-47/32 and 47-47/32) 1-2% matched
(!!) (Best Single) 5963=12AU7 RCA NOS 1959 (12.2/12.4ma)
(!!) (Best Single) 5963=12AU7 RCA NOS 1966 (11/11ma) 1-2% section balance
(!!) (Recommended Pair) 5963=12AU7 Sylvania NOS 1960's (11.8/10.8ma and 10.8/10.4ma)
(!!) (Recommended Pair) 5963=12AU7 Sylvania NOS 1960's (9.8/10ma and 10.8/9.8ma)
(!!) (SINGLE) 5963=12AU7 RCA NOS 1965 (10.8/13.2ma)
(!!) 12AT7 Knight by Mullard NOS 1966 (8.8/9.4ma)
(!!) 5963=12AU7 RCA NOS 1963 (9.2/9.6ma)