Siemens 12AX7/ECC83 Long Plate Single Post O-Getter Made in Germany Label is mostly erased. Very rare early long plate made in 1958 with mC3 code. Early made single post version. Date Code: mC3 ≠8D Made in April 1958 in Germany Fully tested by calibrated Hickok 539C tubes tester with no shorts, leakage or gas. Measurement: 980/1110 where minimum good value is 875 Tested in my preamplifier to make sure working as intended with no issues at all.
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