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Tektronix 7503
90 MHz non-storage mainframe
Tektronix 7503, front view

Produced from 1970 to 1972

Manuals – Specifications – Links – Pictures

The Tektronix 7503 is a 90 MHz 7000-series mainframe with three module bays, introduced in 1970. It was effectively replaced by the larger-screen 7603 in 1972.

The 7503 project was managed by Phil Crosby, and was supposed to be a 7504 but with one fewer plug-in. The 7503 was Tek's first scope to use a harmonica connector for inter-board wiring. Prior to this, inter-board wiring had either mainly been point-to-point soldered. Other approaches were taken on certain instruments, for example the 7704, in which pins sticking out of the chassis mate with holes in the boards that receive the pins and make electrical contact.


Bandwidth 90 MHz with 7A11, 7A16 (and faster plug-ins); 75 MHz with 7A12, 7A13, 7A14
Fastest calibrated sweep 5 ns/Div
CRT 154-0608-xx
Vertical modes Left / Alt / Add / Chop / Right
Trigger Source Left / Vert Mode / Right
Calibrator 4 mV to 40 V in five decade steps, 40 mA, 1 kHz ±0.5%
Outputs Side panel: Vert signal, +Gate, +Sawtooth; At CRT: Camera power
Line Voltage 90-110 V / 104-126 V / 112-136 V / 180-220 V / 208-252 V / 224-272 V, 50—440 Hz
Power Max. 258 W
Weight 21.3 kg / 47 lb (instrument only)
Rear connectors


Like other 75xx and 76xx mainframes and the 7504, the 7503 has a linear power supply, as opposed to the switchmode supplies used in the later 4-slot mainframes.