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12AX7
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12AX7 is a miniature dual-triode 6AV6 vacuum tube with high voltage gain. Developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15,... Wikipedia
Heater current: 150 mA (series); 300 mA (parallel)
Heater voltage: 12.6 V (series); 6.3 V (parallel)
Height: 2.2 in (56 mm)
Max dissipation Watts: 1 per section
Max voltage: 300 V