(!!!) (Single) 7025 Amperex Globe Logo Holland used/good 1967 (Gm=1300/1400 and mA=0.9/1.1ma)
(!!!) 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 Beckman ribbed gray plates used/60% 1960's (Gm=1100/1300 and 0.5/0.7mA)
(!!!) 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 1960's faded printing (Gm=1400/1600 and 0.9/1.1mA) (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)
(!!) (Best Value Pair) ECC83=12AX7 EI Yugo Telefunken NOS smooth plates clone rebranded Amperex and National (1.2/1.2ma and 1.2/1.3ma)
(!!) (Best Value Single) 12AX7=ECC83 Mullard UK copper grid posts used/good 1965 (Gm=1400/1400)
(!!) (Best Value Single) ECC83=12AX7 Tungsram Hungary 1980 era branded Amperex NOS 1985 (1.3/1.6ma and Gm=1800/1800)
(!!) (SINGLE) 7025 RCA gray NOS 1970 era (Gm=1450/1600 and 1.0/1.2mA)
(!) (Best Value) 12AX7A China used/good 1990's no printing (0.9/1.1mA and Gm=1600/1700)
(!) (Best Value) 7025A=12AX7A China branded International Yugo NOS 1990's (1.0/0.9ma and Gm=1700/1600)
(!) (Good Value) 12AX7WXT Sovtek NOS 1990's (Gm=1500/1400 and 0.9/0.8ma)
(!) (MULLARD CLONE) 12AX7=ECC83 Matsushita Japan NOS 1960's (Gm=1600/1500 and 1.2/1.0ma) (similar to Mullard)
(!) ECC83=12AX7 China branded Siemens NOS 1993 (Gm=1300/1500)
