155-0064-00

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.

• 155-0064-00 Specs (1973)
• 155-0064-00 Specs (1973)
• 155-0064-00 Specs (1979)

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	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

Patents that may apply to 155-0064-00

Pictures

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  Schematic and pinout

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  Mechanical