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 ("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.
- 155-0064-00 Specs (1973)
- 155-0064-00 Specs (1979)
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Schematic and pinout
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Mechanical
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)