12B4

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parallel 12B4s (center left) as pass elements in 585 power supply

The 12B4(A)  (P/N 154-044, 154-0044-00) is a power triode vacuum tube with a B9A (Noval) miniature 9-pin base. It has 5.5 W maximum plate dissipation, 1000 V peak plate voltage, and and 105 mA peak cathode current.

The 12B4 is used in the 126, 551, and 555, and as a pass tube in the power supply of the 513, 581/585, and 570.

The 12B4A (154-0044-00) is similar except for the controlled heater warm-up, suitable for use in conjunction with other 600 mA types.

Data

Pictures

Used in

Some instruments using part 12B4

Instrument Manufacturer Class Model Description Introduced
126 Tektronix Plug-in 126 Power Supply Module 1952
310 Tektronix Oscilloscope 310A 4 MHz oscilloscope 1955
310A Tektronix Oscilloscope 310A 4 MHz oscilloscope 1959
316 Tektronix Oscilloscope 316 10 MHz 3" tube scope 1959
317 Tektronix Oscilloscope 317 10 MHz 3" tube scope 1959
502 Tektronix Oscilloscope 502 1 MHz dual beam differential scope 1958
502A Tektronix Oscilloscope 502A 1 MHz dual beam differential scope 1963
513 Tektronix Oscilloscope 513 18 MHz scope 1950
524 Tektronix Oscilloscope 524AD TV waveform monitoring scope 1953
526 Tektronix Audio/Video 526 NTSC Vectorscope 1959
535 Tektronix Oscilloscope 535 10 (15) MHz dual-timebase scope 1954
541 Tektronix Oscilloscope 541 30 MHz oscilloscope 1955
545 Tektronix Oscilloscope 545 30 (33) MHz oscilloscope 1955
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
551 Tektronix Oscilloscope 551 27 MHz scope 1958
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