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(!!!) (Recommended Pair) 6SN7GTB GE used/good 1957-1961 (8.2/7.8ma and 7.6/7.2ma) 1-5% matched
(!!!) (Recommended Pair) JTL-5654=6AK5W Tungsol gray plate "D" getter used/good 1956-1958 (6.4ma and 6.5ma)
(!!!) (Single) 12AT7 GE gray plate NOS 1961 (11.4/14.4ma)
(!!!) (Single) 12AT7 GE gray plate NOS 1975 (8.4ma/6.8ma)
(!!!) (Single) 83 RCA NOS 1956 small amount of graphite flaked off plate (66/40 and 65/40)
(!!!) 418A Western Electric NOS 1952 original box (34ma)
(!!!) 418A Western Electric NOS 1952 original box (41ma)
(!!) (Best Pair #2) 6AR6=6098 Tungsol oval plate NOS 1951 (88ma and 84ma) (1st series made) (Copy)
(!!) (Best Single) 7AF7 Sylvania branded Hytron NOS round black plates NOS 1952 (9.6/9.4ma) 1-3% section balance
(!!) (Best Value Single) EF14 Telefunken Germany used/good 1950 (12.5ma)
(!!) (Recommended Pair) 1619 RCA NOS 1952 - 1960's (52ma and 53.6ma)
(!!) (Set of 4) JHY-6AK5 Hytron black plate NOS 1952 (test between 6-8ma unmatched) (4 for $39.99)
(!!) (slightly microphonic) 6SL7GT RCA NOS black plates gray coated glass 1952 (2.8/2.8ma) 1% section balance
(!!) 5Z3G Westinghouse NOS 1957 (59/40 and 61/40)
(!) (Best Single #1) JHY-6AK5 Hytron black plate NOS 1952 (9.2ma)
(!) (Best Single) 6K6GT GE NOS 1955 (43ma)
(!) (Best Single) JHY-6AK5 Hytron black plate NOS 1952 (8.1ma)
(!) (SINGLE) JAN-CLRV-6SN7WGTA GE Canada brown base NOS 1970 (7.8/6.4ma)
(!) (Single) JHY-6AK5 Hytron black plate NOS 1952 (6.8ma)
(!) 244A Western Electric NOS 1952 smaller side getter (4.4ma)
