(!!!!) (Recommended Pair) ECC83=12AX7 Tungsram Hungary branded IEC Mullard NOS 1982 (1.5/1.6ma and 1.4/1.7ma)
(!!!!) (Recommended Single) 12AX7 Brimar BVA England narrow ribbed plates used/good 1959 (1.1/1.0ma and Gm=1450/1350)
(!!!!) (Recommended Single) ECC82=12AU7 Telefunken Diamond Bottom ribbed plates like new 1960 (14.0/11.2ma) (Close Gm) (Highest mA and Gm)
(!!!!) (Single 1955) 12AU7 Brimar UK NOS gray ribbed plates "D" getter halo 1955 (8.2/10.4ma)
(!!!!) (Slightly microphonic single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1962 (161 Series) (1.0/1.2ma and Gm=1600/1650)
(!!!) (Best Mullard Single) 12AU7=ECC82 Mullard rebranded Philips ribbed plates NOS 1970 (10.2/10.0mA) 1-2% section balance
(!!!) (Best Single) 12AX7A RCA gray ribbed plates NOS 1966 (1.0/1.0ma and Gm=1500/1500) 1% section balance
(!!!) (Best Value Single) 12AX7 Fisher Telefunken ribbed plate used/good 1960 era fair printing (Gm=1400/1600 and 0.9/1.1ma)
(!!!) (Best Value Single) 12AX7=ECC83 Mullard UK ribbed plates used/good 1967 (1.7/0.8ma and Gm=2000/1600) (V1 guitar amp)
(!!!) (Good Value Single) 12AX7=ECC83 Mullard GE UK ribbed plates used/good 1966 (.8/.9ma and Gm=1450/1600)
(!!!) (Recommended Single 1962) ECC83=12AX7 Mullard Webcor ribbed plates used/very good 1962 (161 series) in white box (1.0/1.1ma and Gm=1600/1600)
(!!!) (Recommended Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1450/1600) (1.0/1.3ma)
(!!!) 12AU7=ECC82 Brimar BVA UK ribbed plates like new 1958 (8/9ma)
(!!!) 12AX7=ECC83 Mullard UK "long plates" with "D" getter used/50-60% (0.6/0.7ma Gm=900/1000 - low Gm) (mC1 series)
(!!!) 7025 RCA ribbed gray plates low hours/tests like new 1960's faded printing (Gm=1500/1800 and 0.9/1.3mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1960's (Gm=1350/1450 and 0.7/0.8mA)
(!!!) 7025 RCA ribbed gray plates used/good 1960's (Gm=1350/1600 and 0.6./1.1mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1970 era faded printing (Gm=1500/1500 and 0.9/1.0mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1972 (Gm=1450/1400 and 0.9/0.8mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/tests like new 1960's faded printing (Gm=1500/1500 and 1.1/0.9mA) (V1 guitar amp)