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(!!!!) (Best Value Pair) 6C4WA Philips JAN by Sylvania NOS 1987 (8.8ma and 9.2ma) (same Gm)
(!!!!) (Best Value Pair) EC92=6AB4 Telefunken Germany <> bottom NOS 1964-1965 (7.3ma and 7.0ma) (same Gm) (mic)
(!!!!) (Best Value Pair) JAN-7308 Raytheon NOS 1968 (15.2/10.4ma and 16.8/12.5ma)
(!!!!) (Best Value Single) 6922=E88CC Penta Labs Hungary used/like new 1980 era (13.8/15.8ma)
(!!!!) (Best Value Single) ECC83=12AX7 Telefunken Germany <> bottom ribbed plates branded GAP/R Computor tube used/good 1956 (Gm=1400/1500 and 0.8/0.9ma) 1-5% section balance
(!!!!) (Good Value Pair) 6SN7GTB GE used/good 1956-1957 (7.6/6.8ma and 6.6/7.3ma) (same Gm)
(!!!!) (Good Value Pair) 6SN7GTB GE used/good 1958-1961 (6.4/6.8ma and 6.4/6.6ma)
(!!!!) (Single 1961) 12AU7=ECC82 Mullard BVA UK shield logo NOS 1961 (7.5/9ma) (Gf1 series) (smooth rich sound)
(!!!!) (Single) 5692 RCA RED BASE black plates used/good 1953 (7/8ma) (Schiit Saga+)
(!!!!) (Single) 6922=E88CC Penta Labs Hungary used/good 1980 era (10/15ma)
(!!!!) (Single) 6922=E88CC Siemens Halske Germany branded RCA gray shield used 1966 (12/9.2ma)
(!!!!) (Single) 6DJ8 Philips Holland low hours/like new 1967 (13.6/14.4ma) (sonically the same as Bugle Boy)
(!!!) (Best Pair #3) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (same Gm)
(!!!) (Best Pair #3) 448A Western Electric tipped top used/strong 1965 (30ma and 32ma) (Matched on Amplitrex)
(!!!) (Best Pair #4) 448A Western Electric tipped top used/tests like new 1965 (26.4ma and 26.8ma)
(!!!) (Best Pair) 5751 GE double mica gray plates NOS 1979-1981 (2.4/2.5ma and 2.3/2.6ma) 1-3% matched (Close Gm)
(!!!) (BEST PAIR) 7233 GE NOS 1965 (102-102/60)
(!!!) (Best Single 1965) JHS-12AX7WA Sylvania NOS 1965 (1.3/1.5ma and Gm=1700/1800)
(!!!) (Best Value Pair) ECC84=6CW7 Ultron East Germany by RFT 1970's (10.5/11.5ma and 10.0/10.4ma)
(!!!) (Best Value Pair) ECC84=6CW7 Ultron East Germany by RFT 1970's (12.8/10.6ma and 11.8/11.6ma)
