12AX7

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12AX7A Tube

The 12AX7  (European: ECC83) (P/N 154-043, 154-0043-00) is a dual triode vacuum tube with a B9A (Noval) miniature 9-pin base. The heaters of the two systems can be used in series (12 V, 0.15 A) or parallel (6.3 V, 0.3 A).

The 12AX7 is used in many Tektronix instruments, often as an error amplifier in the power supply, where the tube was chosen for its high gain.

The high-reliability version of the 12AX7 is the 6057 (E83CC). The 5751 is an improved successor.

Aged/Checked/Matched Pair Details
Used in Tek Part# S/N Range
122 157-0032-00 All

Reference:

Tube aging procedure / Selection and checking procedure

Links

Pictures

Used in

Some instruments using part 12AX7

Instrument Manufacturer Class Model Description Introduced
3C66 Tektronix Plug-in 3C66 Carrier amplifier plug-in 1963
513 Tektronix Oscilloscope 513 18 MHz scope 1950
524 Tektronix Oscilloscope 524AD TV waveform monitoring scope 1953
531 Tektronix Oscilloscope 531 10 MHz oscilloscope 1954
535 Tektronix Oscilloscope 535 10 (15) MHz dual-timebase scope 1954
536 Tektronix Oscilloscope 536 11 MHz X–Y oscilloscope 1957
545 Tektronix Oscilloscope 545 30 (33) MHz oscilloscope 1955
545B Tektronix Oscilloscope 545B 30 (33) MHz oscilloscope 1964
546 Tektronix Oscilloscope 546 50 MHz oscilloscope 1964
547 Tektronix Oscilloscope 547 50 MHz oscilloscope 1964
549 Tektronix Oscilloscope 549 30 MHz storage oscilloscope 1965
555 Tektronix Oscilloscope 555 Dual beam 30 MHz scope 1959
570 Tektronix Curve Tracer 570 Curve tracer for tubes 1955
581 Tektronix Oscilloscope 581 100 (95) MHz oscilloscope 1959
581A Tektronix Oscilloscope 581A 85 MHz oscilloscope 1963
585 Tektronix Oscilloscope 585 100 (95) MHz oscilloscope 1959
585A Tektronix Oscilloscope 585 85 MHz oscilloscope 1963
E Tektronix Plug-in Type E Differential amplifier 1955
Hickok 1825 Hickok Plug-in 1825 Differential amplifier 1959
Q Tektronix Plug-in Type Q Strain gauge preamp plug-in 1960