(!!!!!) (2nd Best Phono Pair) ECC83=12AX7 Siemens Halske Germany branded SONOTONE NOS 1962 (1.1/1.1ma and 1.1/1.3ma) 1-2% matched (Aesthetix, EAR, Lamm, VTL, Jadis, Nagra)
(!!!!!) (BEST PHONO PAIR) ECC83=12AX7 Siemens Halske Germany branded SONOTONE NOS 1962 (1.6/2.0ma and 1.6/1.7ma) 1-3% matched (Aesthetix, EAR, Lamm, VTL, Jadis, Nagra)
(!!!!!) (Best Siemens Pair 1968) CV492=ECC83=12AX7 Siemens Halske Germany NOS 1968 1% matched (1.1/1.1ma and 1.1/1.1ma) (best in phono stages and high end preamps)
(!!!!!) (Best Siemens Pair 1968) CV492=ECC83=12AX7 Siemens Halske Germany NOS 1968 1-2% matched (1.1/1.1ma and 1.1/1.2ma) (best in phono stages and high end preamps)
(!!!!!) (Best Siemens Pair 1968) CV492=ECC83=12AX7 Siemens Halske Germany NOS 1968 1-2% matched (1.2/1.3ma and 1.2/1.3ma) (best in phono stages and high end preamps)
(!!!!!) (Best Siemens Pair 1972) E83CC=12AX7 Siemens Halske Germany NOS triple mica 1972 printed in 1976 (1.0/1.3ma and 1.1/1.3ma) (best in phono stages and high end preamps)
