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(!!!!) (Best Single) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (87ma/73ma)
(!!!!) 5998 Tungsol IBM black plates used/very good 1960 (80/96ma) (close Gm)
(!!!) (Best Value Pair) 5998A Sylvania JAN NOS 1980 (111/123ma and 112/119ma) (5998A=7236) 1-3% matched
(!!!) (Best Value Single) 5998A Sylvania JAN NOS 1980 (109/136mA)
(!!!) (PAIR) 5998A Sylvania JAN NOS 1980 (118/131ma and 121/130ma) (5998A=7236) 1-3% matched
(!!!) (Single) 5998A Sylvania JAN NOS 1980 (141/122mA) (close Gm)
(!!) (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)
(!) (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)
(READ REVIEW) 5998A Sylvania JAN NOS 1980 (121/118.5ma and 124/112ma) (5998A=7236)
421A Western Electric NOS 1984 (read review)
