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6EB8 RCA NOS 1970's
(!!!!!) (Recommended Single) CV4035=M8214=12AX7 Brimar England NOS flying leads 1960's (solder leads into ckt)
(!!!!!) (Recommended Single) CV4035=M8214=12AX7 Mullard England box plates NOS flying leads 1961 (solder leads into ckt)
(Best Single) 6EB8 RCA NOS 1960's
6EB8 RCA used/good 1960's
(Best Overall Single) 6EB8 Sylvania NOS 1960's
(!!!!) (5th BEST PAIR) 6SQ7 RCA NOS 1950-1953 (0.9ma and 0.9ma) **
(!!!!) (BEST PAIR) 6SQ7 RCA NOS 1950-1953 (1.0ma and 1.0ma) 1% matched **
7H7 Sylvania branded GE used/good 1940's (101/60)
(!!!!) (BEST PAIR) 6SQ7 RCA NOS 1953 (1.0ma and 1.0ma) 1% matched **
(!!!!) (BEST PAIR) 6SQ7 RCA NOS 1950 (1.0ma and 1.0ma) 1-2% matched **
(!) 6SQ7 Sylvania NOS 1951 (0.9ma and Gm=1000)
(!!!!) (Single) 6BK7B RCA NOS 1960's faded printing (7.4/7.4ma)
(!!!!) (Single) 6BK7B RCA NOS 1962 (7.4/8.3ma)
(!!) (slightly microphonic) 6922=E88CC Tesla Czech Republic NOS 1970 (18.6/20.4ma) (RODE)
(!!!!) (Good Value Pair) 5687WB GE used/good 1970 era (26/27ma and 26.6/27.8ma)
(!!!!) (Good Value Pair) 5687WB GE used/good 1970 era (26.2/27ma and 25.6/28ma)
(!) (Best Single) JAN-6AH6WA Sylvania NOS 1968 (11ma)
(!!!!!) (Best Pair #2) 5687WA and 5687WB GE black plates like new 1970's (39/38.5ma and 37/41ma) (Highest Ma and Gm)
(!!!) (Best Value) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1965 (1.0/0.8mA and Gm=1600/1400)
