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(!!) (1 Pair) 6SH7GT Ken Rad 1950's rebranded Raytheon NOS 1970 (8.8ma and 9.4ma) (same Gm)
(!!) (Read Review) 6SH7GT Ken Rad 1950's rebranded Raytheon NOS 1970 (11.2ma and 11.2ma) (close Gm)
(BEST) 14R7 RCA Victor NOS 1940's (98/60)
6F2 China (best sub is 6U8A, 6GH8A) (Dayton Audio HTA amp)
(!!) (Recommended pair) E83F=6689 Philips SQ Holland NOS gold pins 1974 (9.4ma and 9.6ma)
JHS-6U8A Sylvania NOS 1966
(!!!!) (Best Overall Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (10.2/11.2ma and 10.2/11.2ma) 1% matched (Highest ma and Gm)
(!) (slightly microphonic) 6072 GE branded RCA triple mica black plates "O" getter halo 1960 used/good (2.0/2.0ma)
2A7 Raytheon NOS 1940's (46/29)
(!!!) (Recommended Pair) 26 GE and Ken Rad NOS same build 1940's (3.9ma and 4.0ma)
(!!!) 201A Silvertone Balloon NOS 1930 era (1.8ma and Gm=500)
(!!) 26 GE NOS 1946 (6.7ma, Gm=1200)
(!) 201A Aristocrat NOS 1930's (2.7ma and Gm=900)
6BS8 Tungsol NOS 1960 era (10.2/14ma)
(!!) 26 Super Silvertone by National Union NOS 1940's (5.7ma, Gm=1200)
85 Tungsol JAN NOS 1944 (50/25)
(!!!) CX-301-A Cunningham NOS 1930 era (2.6ma Gm=800)
26 RCA Radiotron/Cunningham engraved used/good 1930's (3.6ma)
85 no printing used/strong 1940's (50/25)
2A7 RCA NOS 1940's (50/29)
