7503

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Tektronix 7503
90 MHz non-storage mainframe
Tektronix 7503, 2×7A12, 7B53A

Produced from 1970 to 1972

Manuals
(All manuals in PDF format unless noted otherwise)
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.

Unlike later three-slot (7xx3) mainframes, the 7503 does supply the +5 V lamp rail, which helps with the contemporary 7A12 plug-in. It also features the 7000-series remote control connector at the rear of the unit.

Key Specifications

Bandwidth 90 MHz with 7A11, 7A16 (and faster plug-ins); 75 MHz with 7A12, 7A13, 7A14
Fastest calibrated sweep 5 ns/Div
CRT T7500 (154-0608-xx), 18 kV total acceleration (+15/-2.96)
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

Internals

In addition to two custom Tek ICs, the 7503 uses CA3046 transistor arrays (156-0048-00) in eight places (five on the regulator board). The vertical and horizontal amplifiers are built using discrete transistors.

The 7503 has an X-Y delay compensation network that is activated when the H plugin is an amplifier or a timebase in amplifier mode (see 7000 Series plug-in interface). This network is switched in using a pair of 148-0034-00 miniature relays on the horizontal amplifier board.

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. In addition to the +5 V, ±15 V, ±50 V rails common to the 7000 series, internally (not on the plug-in slots) it has a +75 V output not found in later models, and a +150 V instead of the later +130 V.

The 7503 contains a mercury-based elapsed time meter on the rear of the main interface board.

Pictures


CRTs used in the 7503

Page Part nos Description Designers Used in
T7500 154-0608-00 CRT 7503

Custom ICs used in the 7503

Page Class Manufacturer Model Part nos Description Designers Used in
155-0011-00 Monolithic integrated circuit Tektronix M012 155-0011-00 clock and chop blanking Les Larson 485 7313 7403N R7403N 7503 7504 7514 7603 AN/USM-281C 7613 7623 7623A 7633 7704 R7704 7704A 7834 7844 7854 7904 7904A R7903 R7912 7912AD 7912HB 7934 7104 R7103 AN/USM-281C
155-0022-00 Monolithic integrated circuit Tektronix M036 155-0022-00 155-0022-01 analog multiplexer Gene Andrews 147 148 149 335 468 1430 1441 1461 1900 1910 2220 2221 2230 5223 5403 5440 5441 5443 5444 5A38 7313 7403N 7503 7504 7514 7603 AN/USM-281C 7613 7623 7623A 7633 7704 R7704 7704A 7834 7844 7854 R7912 7912AD 7912HB 7904 R7903 7904A 7934 7A12 7A18 7A18A 7B52 7B53N 7D10 7D11 7D12 NT-7000 P7001

Custom ICs used in the 7000 series readout system

Page Class Manufacturer Model Part nos Description Designers Used in
155-0014-01 Monolithic integrated circuit Tektronix M019D 155-0014-00 155-0014-01 A/D converter Barrie Gilbert 7000 series readout system 7854 7934 7J20 7L5 P7001
155-0015-01 Monolithic integrated circuit Tektronix M020F 155-0015-00 155-0015-01 analog data switch Barrie Gilbert 7000 series readout system 7854 7934
155-0017-00 Monolithic integrated circuit Tektronix M025 155-0017-00 5 MHz decade counter Barrie Gilbert 7000 series readout system 7854 7934
155-0018-00 Monolithic integrated circuit Tektronix M026 155-0018-00 zeros logic control Les Larson 7000 series readout system 7934
155-0019-00 Monolithic integrated circuit Tektronix M027 155-0019-00 decimal point and spacing control Les Larson 7000 series readout system
155-0020-00 Monolithic integrated circuit Tektronix M028 155-0020-00 output assembler Les Larson 7000 series readout system
155-0021-00 Monolithic integrated circuit Tektronix M029C 155-0021-00 155-0021-01 timing generator Les Larson 7000 series readout system 7854 7934
155-0023-00 Monolithic integrated circuit Tektronix M160 155-0023-00 character generator (0 1 2 3 4 5 6 7 8 9) Barrie Gilbert 7000 series readout system
155-0024-00 Monolithic integrated circuit Tektronix M161 155-0024-00 character generator (↓ < I / + - + C Δ >) Barrie Gilbert 7000 series readout system
155-0025-00 Monolithic integrated circuit Tektronix M162 155-0025-00 character generator (m μ n p X K M G T R) Barrie Gilbert 7000 series readout system
155-0026-00 Monolithic integrated circuit Tektronix M163 155-0026-00 character generator (S V A W H d B c Ω E) Barrie Gilbert 7000 series readout system
155-0027-00 Monolithic integrated circuit Tektronix M164 155-0027-00 character generator (U N L Z Y P F J Q D) Barrie Gilbert 7000 series readout system