(!!!!!) (Best Overall Single) 6SC7GTY Tungsol NOS black round plates NOS 1950 era - small chip out of base (2.1ma and 2.2ma)
(!!!!) (Best Single) 12BH7A GE ribbed plates NOS 1980 (10.0/10.2ma) 1-3% section balance
(!!!!) (Best Single) 12BH7A Sylvania rebranded GE black oval plates "U" getter NOS 1956 era (11.2/14ma)
(!!!) (Best Overall Pair) 6SC7 GE metal can NOS 1970's (1.9/1.9ma and 1.9/1.8ma) 1-2% matched
(!!!) (Best Overall UV-99) C-299=UV-99 Cunningham NOS 1920's with tube data sheet (3.4ma) (highest Ma) (UV have small pins)
(!!!) (Best Pair) 99=X99 Ken Rad NOS 1940's (2.5ma and 2.6ma)
(!!!) (Best Single) CX-299 Cunningham engraved base NOS 1920's (2.9ma) (X-99=UX-199=CX-299)
(!!!) (Good Value Pair) 6SC7 GE metal can NOS 1977 (1.6/1.9ma and 1.6/1.9ma) 1% matched
(!!!) (Recommended Pair) 6SC7 GE metal can NOS 1969-1977 (1.7/1.9ma and 1.6/1.8ma) (same Gm)
(!!!) (Recommended Pair) 6SC7 GE metal can NOS 1977 (1.7/1.7ma and 1.7/1.8ma) 1-2% matched
(!!!) (Recommended Pair) 6SC7 GE NOS 1977 (1.7/2.1ma and 1.8/2.1ma) 1-3% matched
(!!!) (Recommended Single) C-299=UV-99 Cunningham NOS 1920's (2.3ma) (highest Ma) (UV have small pins) (strong Gm)
(!!!) (Recommended Single) C-299=UV-99 Cunningham NOS 1920's with tube data sheet (2.4ma) (highest Ma) (UV have small pins) (strong Gm)
(!!!) (Recommended Single) C-299=UV-99 Cunningham NOS 1920's with tube data sheet (2.6ma) (highest Ma) (UV have small pins) (strong Gm)
(!) (Best Single) 6SC7 Raytheon NOS 1952 (2.3/2.3ma)
(!) (Recommended Single) X-99 RCA Cunningham Radiotron engraved base NOS 1930's (2.5ma) (X-99=UX-199=CX-299)
(!) 30 Philco engraved base NOS 1930's (3.7ma)
(!) UX-199 RCA Radiotron NOS original box 1920's (2.3ma)
(BEST PRICE) 25Z6GT US Brands NOS (10 for $29.99)
(BEST PRICE) 25Z6GT US Brands NOS (4 for $14.99)