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(!) (Best Single) 12SF5GT National Union NOS 1950 (2.1ma Gm=1600)
(!) (Best Single) 2A5 RCA by Sylvania NOS 1947 (89/50)
(!) (Best Single) 2A5 RCA NOS 1940's (93/50)
(!) (Best Single) 2X2 National Union NOS 1950 era (59/40)
(!) (Best Single) 37 GE ribbed plate NOS 1943 (8.0ma)
(!) (Best Single) 393A GE made for WE NOS 1940's original box, strong output (64/40)
(!) (Best Single) 57 Hytron NOS 1940's (50/31)
(!) (Best Single) 5725W=6AS6 Phillips by Sylvania NOS (7ma)
(!) (Best Single) 5726=6AL5W Raytheon NOS 1960's (50/40 and 50/40)
(!) (Best Single) 5Z3G RCA FAA NOS 1962 (56/40 and 55/40)
(!) (Best Single) 6111 France NOS 1962 (7.0/7.4ma) (close triode balance)
(!) (Best Single) 6AS7GA GE NOS 1962 (138ma and 144ma)
(!) (BEST SINGLE) 6BA6 Brimar England NOS 1960's (10.8ma)
(!) (BEST SINGLE) 6BE6 TEN Japan NOS 1960's (1.5ma Gm=900)
(!) (Best Single) 6BR8A RCA NOS 1959 (16.6/10.8ma)
(!) (BEST SINGLE) 6CJ3=6DW4B Sylvania branded Philips tipped top NOS (88/60)
(!) (BEST SINGLE) 6DQ5 Sylvania NOS 1960's (135ma)
(!) (Best Single) 6DQ6B RCA NOS 1970's (120ma)
(!) (Best Single) 6GK5=6FQ5A RCA NOS 1960's (13.6ma)
(!) (Best Single) 6GK5=6FQ5A Sylvania branded Raytheon NOS (15.2ma)
