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(!!!!) (Best Single) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (87ma/73ma)
(!!) (Best used single #1) 5998 Tungsol branded IBM black plates used/good 1960 rattle inside base (75/74ma) 1-3% section balance
(!!) (Best used single #3) 5998 Tungsol branded IBM black plates used/good 1960 rattle inside base (70ma/92ma) (strong Gm)
(!!!!) 5998 Tungsol IBM black plates used/very good 1960 (80/96ma) (close Gm)
(!) (Best Value used) 5998 Tungsol branded IBM black plates used/good 1961 very small rattle inside base (68ma/67ma)
(!) 5998 Tungsol branded IBM black plates used/good 1961 in white box (62ma/68ma)
6AB4 Tungsol NOS "D" getter 1950's (13.2ma)
(!!) (Good Value Single) 5687 Tungsol Hewlett Packard bronze plates "O" getter like new 1960 (32.5/33.7ma)
6N6G Tungsol coated glass NOS 1940's (39ma)
(!!) (Recommended Single) 5654=6AK5W Tungsol gray plate NOS 1950's (6.8ma)
7581 Tungsol brown base used/75% 1964 (52.5ma)
(!!) (Best Single) 5687 Tungsol rebranded CBS black plates "U" getter NOS 1950's (38/48ma)
(!!!) (Good Value Single) 6SN7GT Tungsol parallel gray plates NOS 1953 double large "O" mica - vertical crack in base (9.8/8.2ma) (rare)
(!!!!) (Best Tungsol Pair 1959) 12AU7A Tungsol ribbed plates NOS "U" getter halo 1959 (8.5/8.8ma and 8.8/7.8ma)
(!!) (Best Pair) 6CA4 Tungsol branded RAD TEL NOS 1961 (52/40 and 52/40 x 2 tubes) 1% matched
(!!) (BEST SINGLE) 6BL7GTA Tungsol NOS 1960 era (43/44ma)
(!!!!) (Best Pair #3) 5881 Tungsol branded RCA used/good 1963 (60ma and 62ma)
(!!!!) (Single) 6550 Tungsol branded Sylvania smooth gray plate used/goo 1960 era (116ma)
(!!!!) (Best Value Pair) 5881 Tungsol and Tungsol branded RCA NOS 1957-1959 (63ma and 63ma)
(September 11th, 2026)
