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(!!!) 12AU7A GE "U" getter low hours/tests like new 1957 (10.0/8.8ma)
(!) (Best Value Single) 5687WA Sylvania JAN used/good faded printing 1970's (31/35.8ma)
(!) ECC189=6ES8 Amperex Globe Logo Holland NOS 1969 (17.8/17.2ma)
(!!!) (BEST PRICE) 12AU7A GE used/good 1969 - 1980 (4 for $29.99)
(!!!!!) (Best Overall Single) CK-5687WB Raytheon black plates NOS 1960's (40.5ma/42ma) (Audio Note, Modwright, Manley) Highest mA and Gm
(!) (Best Pair) 6KT8 Sylvania NOS 1970's (4.4/12ma and 5.2/13ma)
(Best Single) 6KT8 US Brands NOS (7/16) (highest testing single)
6JT8 Sylvania big bottle NOS 1960's (3.1/18ma)
(!!) (Best Value Pair) 6FQ7 GE branded Amperex and Westinghouse NOS 1970's (6.4/7.4ma and 6.4/7.4ma) 1-2% matched
6CS7 RCA NOS 1970's (23.6ma and 13.5ma)
(!!!!) (Best Quad #1) 6SH7 GE metal can NOS 1976 (10.6, 10.6, 10.4, 10.5mA)
(!!) (Best Quad #2) 6SH7 GE metal can NOS 1976 (8.6, 9, 9, 9mA)
(!!) (Best Pair #1) 6SH7 GE metal can NOS 1976 (12.8ma and 13.2ma) **
(!!) (Best Pair) 6SH7 GE metal can NOS 1976 (11.5ma and 11.6ma) **
(!!) (Recommended Pair) CX-112A Cunningham Balloon engraved base used/good 1930 era (6.2ma and 7.0ma) (same Gm)
(!) UX-112A Radiotron Balloon engraved base used/good 1930 era (7.4ma)
(!!) 6AN8A RCA NOS 1960's (13.2/12.8ma)
(!!!!) (Read Review) 12AX7A=ECC83 Matsushita Japan NOS rebranded Raytheon NOS 1970 era (Gm=1800/1800 and 1.5/1.3ma) (similar to Mullard)
85 RCA used/good 1940's (44/25)
6Y7G US Brands NOS (12 in stock) ($2.99 special price)
