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(PAIR) 6ER5 RCA NOS 1960's - 1970's (9.5ma and 9.2ma)
(!) 6922=E88CC Philips Holland SQ gold pins used/75% 1973 (8.8/8.5ma) (Same Gm)
(!!!!) (Best Pair #1) 6U8A Philips by Sylvania NOS 1986 (19.0/9.8ma and 18.4/10ma) 1-3% matched (Copy)
(!!!) (Best Value) 7025 RCA gray pinched plates used/good 1961 era (Gm=1300/1400 and 0.6/0.8mA) (recommended for guitar amp)
(!!) (Best Single) 12BH7A Westinghouse Canada ribbed plates NOS 1967 (12.2/14.2ma)
(!!!!!) (Best Single #1) EF806S=EF86 Telefunken Germany <> bottom NOS 1965 (3.7mA and Gm=2300) (Neumann U67, Shindo, Lawson)
(!!!!!) (Best Overall Pair #2) EF806S=EF86 Telefunken Germany <> bottom NOS 1965 same date codes (4.1mA and 4.2ma) (Close Gm) (Neumann U67, Shindo, Lawson)
