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(!!!!) (BEST PAIR #1) EL84 Siemens Halske Germany NOS 1977 (46.5ma and 46ma)
(!!!!) (Best Siemens Pair) EL84 Siemens Halske Germany used/test like new 1971 (48.2ma and 48.5ma) (High Gm)
(!!!) (Best Pair #1) EL84 Siemens Halske Germany NOS 1967-1968 (48.5ma and 49ma) 1-3% matched
(!!!) (Best Pair #3) EL84 Siemens Halske Germany NOS 1969-1971 (54.0ma and 57.6ma) (Highest mA and Gm)
(!!!) (Best Single) ECC83=12AX7 Siemens Halske Germany NOS 1966 (162 Series) (Gm=1500/1600 and 1.0/1.1ma)
(!!!) (Best Value Single) 12AX7=ECC83 SIEMENS HALSKE GERMANY used/good 1962 (0.9/1.0ma)
(!!!) (Best Value Single) 12AX7=ECC83 SIEMENS HALSKE GERMANY used/good 1966 (0.8/0.9ma)
(!!!) (Best Value Single) 12AX7=ECC83 SIEMENS HALSKE GERMANY used/good 1967 (0.8/0.9ma)
(!!!) (Best Value Single) ECC83=12AX7 Siemens Halske Germany used/good 1960's faded date code (1.3/0.9ma and Gm=1700/1500)
(!!) (Good Value) 12AX7 Siemens Halske Germany rebranded "BOGEN" used/good 1960 (161 Series) (Gm=1400/1500 and 0.8/0.9ma)
