155-0064-00

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 ("f_t 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

7834, 7854 (A18U150)
7904, R7903 (U745, vertical output in SN B260000 and up; B259999 and below use 155-0065-00)
7912AD (A34U745)
485
PG502 (U400) (earlier SN, later 155-0125-00)

Some instruments using part 155-0064-00

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

Patents that may apply to 155-0064-00

Page	Title	Inventors	Filing date	Grant date	Links
Patent US 3633120A	Amplifier circuit	Carl Battjes	1970-09-16	1972-01-04	Ft doubler • 155-0061-00 • 203-0126-90 • 155-0064-00 • 155-0077-00 • 155-0078-00 • 155-0080-00 • 155-0175-00 • 155-0176-00 • 155-0178-00 • 155-0181-00 • 155-0187-00 • M080