(!!!) (Good Value Single) 6SN7GTB Tungsol tall bottle used/good 1960 era (7.5/7.5ma) 1% section balance
(!!!) (Recommended Pair 1963) JG-5751 GE double mica gray plates NOS 1963 (2.0/1.9ma and 1.9/1.8ma) (same Gm)
(!!!) (Recommended Pair) 12AU7A GE NOS 1965-1975 (8.8/8.8ma and 9.2/8.8ma) (Same Gm) (smooth and warm)
(!!!) (Recommended Pair) 12BZ7 RCA NOS 1964 and 1968 (1.8/1.8ma and 1.8/1.9ma)
(!!!) (Recommended Single 1963) JG-5751 GE double mica gray plates NOS 1963 (2.2/2.4ma)
(!!!) (Recommended Single) 12AT7=ECC81 Mullard branded Raytheon NOS 1972 (13.2/11.0ma)
(!!!) (Recommended Single) 12AT7=ECC81 Siemens Halske Germany branded "SATOR" NOS 1964 (8.2ma/8.2ma) 1-2% section balance
(!!!) (Recommended Single) 12AT7=ECC81 Siemens Halske Germany NOS branded VALVO 1966 (9.0ma/10.6ma)
(!!!) (Recommended Single) 12AU7A GE NOS 1963 (8.6/9.5ma)
(!!!) (Recommended Single) 12AX7=ECC83 Mullard UK old logo copper grid posts used/good 1963 (.9/1.0ma and Gm=1500/1500)
(!!!) (Recommended Single) 12BH7A CBS Oval Black Plates "O" getter NOS 1960 (11/12.5ma)
(!!!) (Recommended Single) 12BH7A Westinghouse black ribbed plates "U" getter halo 1961 (8.5/10ma)
(!!!) (Recommended Single) 310A Western Electric large punch plate NOS 1963 (8.2ma)
(!!!) (Recommended Single) 5751 GE double mica gray plates NOS 1979 (2.4/2.5ma)
(!!!) (Recommended Single) 5U4G Tungsol low hours/tests like new 1955 (57/40 and 57/40)
(!!!) (Recommended Single) JAN-5751 GE double mica gray plates NOS 1981-1982 (2.3/2.7ma)
(!!!) (Single) 12AU7 Philips Australia NOS 1970 era (9.6/84ma) (same internals as Holland made)
(!!!) (Single) 12BH7A CBS Oval Black Plates "O" getter used/good 1960 (7.3/9.6ma)
(!!!) (single) ECC81=12AT7 Philips Miniwatt by Mullard UK like new "o" getter 1957 (8.2/7.6ma) (Mitcham plant)
(!!!) (slightly microphonic) ECC81=12AT7 Miniwatt by Mullard NOS 1970 (9.6/10.6ma)
