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: the M080 differential amplifier ("f_t doubler"), and two D078 NPN output transistors in common-base configuration.

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 (PDF)
• Media:155-0064-00.pdf

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  Schematic and pinout

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  Mechanical

Used in

• 7834, 7854 (A18U150)
• 7904, 7903 (U745, vertical output in SN B260000 and up; B259999 and below use 155-0065-00)
• 7912AD (A34U745)
• 485
• PG502 (U400)