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(!!!) (Best Value) 12AX7A RCA Hewlett Packard Sanborn Division NOS 1967 (0.8/0.8ma and Gm=1300/1400)
(!!!) (Best Value) 7025 RCA gray pinched plates used/good 1961 (Gm=1400/1800 and 0.8/1.5mA) (recommended for guitar amp)
(!!!) (Best Value) 7025 Silvertone Hitachi Japan ribbed gray plates low hours/tests like new 1960's (Gm=1700/1800 and 1.2/1.4mA) (V1 guitar amp)
(!!!) (Good Value Pair) 6SC7 GE metal can NOS 1977 (1.6/1.9ma and 1.6/1.9ma) 1% matched
(!!!) (Good Value Pair) 6V6GTA GE NOS 1970's (39ma and 40.7ma)
(!!!) (Good Value Single) 12AX7 GE tall narrow ribbed plates used/good "D" getter 1952 (Gm=1300/1600) (oldest 12AX7)
(!!!) (Good Value Single) 12AX7A RCA Magnavox ribbed plates used/good 1961 (Gm=1500/1900 and 0.8/1.3ma)
(!!!) (Good Value Single) 12AX7A RCA ribbed plates used/good 1960's faded printing (Gm=1400/1700 and 0.8/1.1ma)
(!!!) (Recommended Pair) 12AT7 RCA gray plates NOS 1971 (7.2/8.0ma and 7.6/6.6ma) (close Gm)
(!!!) (Recommended Pair) 12AT7 RCA gray plates NOS 1974 (10.5/7.5ma and 10.8/8.2ma)
(!!!) (Recommended Pair) 5Y3GT Philips Holland NOS 1960's (61-68/40 and 60-68/40)
(!!!) (Recommended Quad) 5Y3GT Philips Holland NOS 1960's (1 set of 4)
(!!!) (Recommended Single) 12AX7A RCA gray ribbed plates NOS 1971 (Gm=1600/1800 and 1.2/1.4ma)
(!!!) (Recommended Single) 12AY7 GE NOS 1970 (2.0/2.3ma)
(!!!) (Recommended Single) ECC83=12AX7 Mullard Webcor ribbed plates used/good 1962 (161 series) in white box (1.0/0.7ma and Gm=1600/1400)
(!!!) (Single 1950's) 12AX7 RCA "tall gray plates" with "D" getter used/good mid-1950's (Gm=0.8/1.0ma and Gm=1600/1700) (Gm like new)
(!!!) (Single 1955) JG-12AY7 GE "D" getter like new 1955 (3.3/2.7ma) (High Gm)
(!!!) (Single 1956) 12AY7 GE "D" getter like new 1956 (3.1/2.8ma)
(!!!) (Single) 7025 Amperex Globe Logo Holland used/good 1967 (Gm=1300/1400 and mA=0.9/1.1ma)
(!!!) 12AY7 GE NOS rebranded Raytheon 1960's (2.8/3.4ma)
