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(!!) (Single) PCC88=7DJ8 Philips Holland 1973 (9.5/10.6ma)
(!!) (Single) UX-120=20 Radiotron used/60% 1920's (4.8ma)
(!!) (slightly microphonic single) 12BZ7 RCA gray plates NOS 1966 (2.3/3.0ma)
(!!) (slightly microphonic) 12AX7 Sylvania Zenith black ribbed plates "D" getter NOS/80% 1953 (Gm=1300/1400 and 0.9/1.0ma)
(!!) (slightly microphonic) 6SL7GT RCA NOS 1950 (2.2/2.3ma) 1-2% section balance
(!!) (sold out) JAN-CRC-808 RCA NOS 1943-1945 (strong output)
(!!) (~ Best Value Pair ~) 56 Sylvania test like new 1940's (5.3ma and 5.5ma)
(!!) (~ Best Value ~) 12AT7 Toshiba JAPAN black plates rebranded CM Curtis Mathes NOS 1960's copper grid posts (9.0/9.2ma)
(!!) (~ Recommended Pair ~) 6JD6 GE branded RCA NOS same date codes (13ma and 14ma)
(!!) 12AT7 Brimar black plates NOS/70-75% 1955 (5.6/5.8ma)
(!!) 12AT7 Knight by Mullard NOS 1966 (8.8/9.4ma)
(!!) 12AU7A RCA clear top used/good 1960's (7.4/8.6ma)
(!!) 12AU7A RCA clear top used/good 1964 (8.2/8.6ma)
(!!) 12AU7A Toshiba Japan branded Raytheon ribbed plates NOS 1960's (12/11.2ma) (Same Gm)
(!!) 12AU7WA=6189 Sylvania NOS 1960's (8.8/9.0ma)
(!!) 12AX7 Baldwin Sylvania "D" getter used/tests like new 1959 (1.9/1.9ma) 1% section balance
(!!) 12BH7A Philco Sylvania gray oval plates "O" getter halo used/good 1962 (6.5/7.3ma)
(!!) 12BH7A RCA gray plates used/good 1960's (8.0/11.2ma)
(!!) 12BH7A RCA gray plates used/good 1970 era (8/9ma)
(!!) 12BH7A Sylvania NOS pinched plates 1970's (7.4/8.8ma)
