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(!!!) (Best Pair #1) 5998A Sylvania JAN NOS 1980 (127/134ma and 123/136ma) (5998A=7236)
(!!!) (BEST PAIR #2) 5998A Sylvania JAN NOS 1980 (121/118.5ma and 124/112ma) (5998A=7236)
(!!!) (Best Single #3) 5998A Sylvania JAN NOS 1980 (124/119mA)
(!!!) (Best Single) 5998A Sylvania JAN NOS 1980 (127/135mA) (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
(!!!) (Recommended Single) 5998A Sylvania JAN NOS 1980 (124/130mA)
(!!!) (Single) 5998A Sylvania JAN NOS 1980 (141/122mA) (close Gm)
421A Western Electric NOS 1984 (read review)