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The Tektronix H074A  (P/N 155-0064-00) is a vertical output amplifier hybrid integrated circuit in a 12-pin TO-8 stud mounted can, developed by Tektronix in the early 1970s.

Maximum power dissipation is 4 watts. Rise time is specified as 470 ps (equiv. bandwidth 745 MHz).

The hybrid consists of three dice on a BeO substrate − an M080 differential amplifier ("ft doubler"), and two D078 NPN output transistors in common-base configuration.

It is the same as the 155-0065-00 (H074), except for the case stud and specified pin 3 to case breakdown voltage.

There is also an H074B (155-0125-00) version.

According to Modification 050-1014-00, Vertical Output Microcircuit Replacement, the emitter resistors need to be selected according to a code printed on the device.

Used in

Some instruments using part 155-0064-00

Instrument Manufacturer Class Model Description Introduced
485 Tektronix Oscilloscope 485 350 MHz portable scope 1972
7834 Tektronix Oscilloscope 7834 400 MHz storage mainframe 1977
7854 Tektronix Oscilloscope 7854 400 MHz waveform-processing scope 1980
7904 Tektronix Oscilloscope 7904 500 MHz non-storage mainframe 1971
7912AD Tektronix Oscilloscope 7912AD 500 MHz digitizer 1978
PG502 Tektronix Plug-in PG502 250 MHz pulse generator 1974
R7903 Tektronix Oscilloscope R7903 500 MHz non-storage mainframe 1974