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(!!!!) (Best Quad) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.8/9.5, 8.8/9.4, 9.0/9.3, 9.0/9.4mA) (Highest Gm 1-2% matched)
(!!!!) (Best Single #3) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (12.0/10.2ma)
(!!!!) (Best Single 1966) 12AX7=ECC83 Philips Holland NOS 1966 (2.1/1.9ma and Gm=2100/2100) (Highest mA and Gm)
(!!!!) (Best Single) 12AX7=ECC83 Philips Holland NOS 1969 (1.0/1.1ma and Gm=1600/1600) 1-2% section balance
(!!!!) (Best Single) 5692 RCA RED BASE black plates like new 1950 (10.0/9.2ma)
(!!!!) (Best Single) E88CC=6922 Telefunken Germany <> bottom NOS 1962 (16.4/17.5ma) (mic grade)
(!!!!) (Best Single) EZ81 Mullard Blackburn UK "D" getter NOS 1963 (57/40 and 57/40) 1% section balance
(!!!!) (Best Value Pair #1) 12AX7A RCA gray ribbed plates NOS 1967-1973 (best tone) (0.9/0.9ma and 0.9/1.1ma) (Fender)
(!!!!) (Best Value Pair #1) PCC88=7DJ8 Philips by EI Yugoslavia "O" getter NOS 1971-1974 (15.2/11.0ma and 15.6/12.7ma) (sweet sound - Same as Holland made) (close Gm)
(!!!!) (Best Value Single) EZ81 GE Mullard Blackburn UK NOS 1966 (57/40 and 60/40)
(!!!!) (Best Value Single) EZ81 Mullard Blackburn UK "O" getter like new 1964 (56/40 and 57/40) 1-2% section balance
(!!!!) (Best Value Single) EZ81 Mullard Blackburn UK branded Pope Holland "D" getter used/strong 1963 (56/40 and 57/40)
(!!!!) (Best Value Single) EZ81 Mullard Blackburn UK branded VALVO like new 1964 (57/40 and 58/40)
(!!!!) (Good Value 1962) M8137=12AX7S Philips SQ France ribbed plates NOS 1962 (0.8/0.9ma and Gm=1350/1350) (Special Quality 12AX7)
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.0/10.4ma and 9.4/10.0ma) 1-3% matched
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/8.8ma and 9.4/9.0ma) 1-2% matched
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/9.4ma and 9.8/9.6ma) 1-3% matched (same Gm)
(!!!!) (Recommended Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.6/11.3mA)
(!!!!) (Recommended Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/10.8mA)
(!!!!) (Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.8/8.6ma)
