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(!!!) (Recommended Pair) 12AU7A GE NOS 1965-1975 (8.8/8.8ma and 9.2/8.8ma) (Same Gm) (smooth and warm)
(!!) (Best Value Pair) 12AU7A RCA MEXICO NOS "TOP GETTER" original boxes 1970's (9.2/11.4ma and 9.4/10.6ma)
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 very good printing (10.0/10.8ma) (high Gm)
(!!!!) (Good Single 1950) 12AU7 Sylvania black plates "D" getter NOS 1950 (11/12.8ma)
JHS-12AU7 Sylvania "black plates" with "D" getter used/mis-matched sections (7.6/12ma)
(!!) 12AU7WA=6189 Sylvania NOS 1960's (8.8/9.0ma)
(!!!) (Best Single) 12AU7WA=6189 Sylvania NOS 1960's (10/10ma) 1-2% section balance
(!!!) 12AU7A GE "U" getter like new 1959 (10.8/10.2ma)
(!!!!) (Best Pair #2) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.6/8.8ma and 8.8/9.2ma) 1-3% matched
(!!!!) (Best Pair #2) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.8/8.4ma and 8.4/8.8ma) 1-2% matched
(!!!!) (Best Overall Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (10.2/11.2ma and 10.2/11.2ma) 1% matched (Highest ma and Gm)
(!!!) (Recommended Single) CV491=12AU7=ECC82 Brimar England NOS ribbed plates 1974 (9.4/9.2ma)
(!!!) 12AU7A GE "U" getter low hours/tests like new 1957 (10.0/8.8ma)
(!!!) (BEST PRICE) 12AU7A GE used/good 1969 - 1980 (4 for $29.99)
(!!!!) (Best Pair #2) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.4/8.8ma and 8.4/9.0ma) 1-2% matched (same Gm)
(!!!) (Good Value Single) JAN-6189=12AU7WA Sylvania NOS 1960 era in white box (8.6/10ma)
(!!!!) (Best Overall Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (11.2/11.7ma) 1-2% section balance (Highest mA and Gm)
(!!!!) (Best Single #3) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (12.0/10.2ma)
(!!!!) (Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.8/8.6ma)
(!!) (BEST GE Pair) 5963=12AU7 GE branded RCA NOS ribbed plates 1978 (13.0/11.4ma and 12.6/11.4ma)
