12BY7A

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The 12BY7A  (European: EL180) (P/N 154-047,154-0047-00) is a miniature 6.5 W power pentode vacuum tube.

Both the 12BY7 (1951) and the slightly improved 12BY7A (1954/1955) are all-glass types with a B9A (Noval) miniature 9-pin base and share the EIA 9BF pinout with a number of other miniature pentode tubes of the era.

Aged/Checked/Matched Pair Details
Used in Tek Part# S/N Range
531, 533, 535, 536, 541, 543, 545, 555 157-0053-00 ?
106 157-0115-00 Note 1

Note 1: Made obsolete soon after the number was allocated.

Reference:

Tube aging procedure / Selection and checking procedure

Data sheets and Links

9BF socket diagram
9BF socket diagram

Used in

  • the output stage of the 1121
  • the first stage of the 535, 545A, and 555

Some instruments using part 12BY7A

Instrument Manufacturer Class Model Description Introduced
106 Tektronix Pulse generator 106 Pulse generator 1966
163 Tektronix Plug-in 163 Pulse Generator Module 1952
3A75 Tektronix Plug-in 3A75 4 MHz amplifier plugin 1964
3B5 Tektronix Plug-in 3B5 Automatic time base plug-in 1966
524 Tektronix Oscilloscope 524AD TV waveform monitoring scope 1953
531 Tektronix Oscilloscope 531 10 MHz oscilloscope 1954
533 Tektronix Oscilloscope 533 15 MHz oscilloscope 1958
535 Tektronix Oscilloscope 535 10 (15) MHz dual-timebase scope 1954
535 Tektronix Oscilloscope 535 10 (15) MHz dual-timebase scope 1954
536 Tektronix Oscilloscope 536 11 MHz X–Y oscilloscope 1957
541 Tektronix Oscilloscope 541 30 MHz oscilloscope 1955
543 Tektronix Oscilloscope 543 30 MHz oscilloscope 1958
545 Tektronix Oscilloscope 545 30 (33) MHz oscilloscope 1955
549 Tektronix Oscilloscope 549 30 MHz storage oscilloscope 1965
555 Tektronix Oscilloscope 555 Dual beam 30 MHz scope 1959
75 Tektronix Plug-in 75 4 MHz amplifier plug-in 1961

Pictures