(!!!!) (Holland Single) 12AU7 Philips Miniwatt Holland like new 1961 large "O" getter halo (9.6/11ma)
(!!!!) (Recommended Pair) 5V4G RCA 1950's low hours/like new (60-62/40 and 60-64/40)
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (10.4/11.4ma and 10.0/11.0ma)
(!!!!) (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 Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.8/11ma and 10/10.9ma) 1-2% matched
(!!!!) (Recommended Single) 5751 RCA Hewlett Packard black plates NOS 1968 (2.2/2.0ma)
(!!!!) (Recommended Single) 5751 RCA Hewlett Packard black plates NOS 1968 (2.4/2.6ma)
(!!!!) (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 (9.4/11.3mA)
(!!!!) (Single 1959) ECC82=12AU7 Philips Miniwatt Holland like new low hours/tests like new 1959 (10.6/9.8ma)
(!!!!) (Single 1964) ECC82=12AU7 Miniwatt Philips Canada NOS 1964 (9.2/9.8ma) (same build as Holland)
(!!!!) 5V4GA GE NOS 1977 (60/40 and 60/40)
(!!!) (Best 5-Star) 5814A=12AU7 GE Electronic Secretary "5 STAR" triple mica NOS 1960 (10.8/10.4ma) (Same Gm)
(!!!) (Best Pair) 6F6GT Tungsol NOS 1954 (34ma and 34.5ma)
(!!!) (Best Pair) 6GV8=ECL85 RCA Holland NOS 1966-1969 (6.7ma/58ma and 5.8ma/56ma)
(!!!) (Best Single #2) 6688=E180F Amperex PQ USA NOS 1965 (15.2ma)
(!!!) (Best Single 1954) 5814A=12AU7 GE "5 Star" triple mica NOS 1954 (10.2/10.8ma)
(!!!) (Best Single 1960) 5814A=12AU7 GE "5 STAR" triple mica NOS 1960 (10.0/10.4ma) 1-3% section balance
