The Tektronix 7603 is a general-purpose 100 MHz non-storage, large-screen scope that takes two 7000-series vertical plug-ins and one 7000-series horizontal plug-in.

Variants include the a rack-mount version (R7603), and the AN/USM 281C, a ruggedized 7603 without readout (was also known as 7603N Option 11S) that includes two AM-6565 (7A15AN11) single-trace amplifiers, a TD-1085 (7B53AN11) dual time base, and a clip-on front panel cover with probes and accessories.

Key Specifications

Bandwidth 100 MHz with 7A11, 7A16, 7A17, 7A24, 7A26; 110 MHz with 7A19, 70 MHz with 7A18
Fastest calibrated sweep 5 ns/Div
CRT
  • Standard: P31 phosphor, 8 × 10 divisions of 1.22 cm (Tek T7400/154-0640-00 tube); 15 kV acceleration (-3/+12); Option 8: P11 phosphor
  • Opt. 4 : P31 phosphor, 8 × 10 divisions of 1.0 cm (Tek 154-0672-00 tube); 18 kV acceleration
  • Opt. 6 : P31 phosphor, 8 × 10 divisions of 1.22 cm (Tek 154-0673-00 tube, spectrum analyzer graticule)
Vertical modes Left / Alt / Add / Chop / Right
Trigger Source Left / Vert Mode / Right
Inputs Z Axis
Outputs Camera power, Vert signal, +Gate, +Sawtooth
Power 100 / 110 / 120 / 200 / 220 / 240 V, +/- 10%, 50—440 Hz, max. 170 W
Weight 13.6 kg / 30 lb (instrument only)
Operating Environment 0°C – +50°C, < 15,000 ft

Options

Due to the long production time of the 7603 many options were available. As some options became standard (e.g. built-in fan) some numbers were assigned twice. Later models were equipped with an IEC320 mains socket, making all Ax (power cable style) options obsolete.

  • Opt.1: Without readout (= 7603N)
  • Opt.3: Extra EMI shielding
  • Opt.4/Opt.13: Maximum-brightness CRT with reduced area (8x10 cm graticule)
  • Opt.5: Fan
  • Opt.5 (later models): 400 Hz line frequency
  • Opt.6: Spectrum analyzer graticule
  • Opt.7: Without Signals Out
  • Opt.8: P11 phosphor
  • Opt.8 (later models): protective front panel cover, 7603 only
  • Opt.11S: Ruggedized variant AN/USM 281C, specified at 50 MHz
  • Opt.20: Rear GPIB socket for 7D20, removes +Sawtooth, +Gate, vertical signal outputs, R7603 only
  • Opt.76: P7 phosphor
  • Opt.77: P7 phosphor with spectrum analyzer graticule
  • Opt.78: P11 phosphor

Links

Documents Referencing 7603

Document Class Title Authors Year Links
Tekscope 1977 V9 N1.pdf Article Counter and Oscilloscope Combination Makes Difficult Measurements Emory Harry 1977

Internals

The 7603 was made in various versions for many years, with revisions to some subassemblies like the vertical output amplifier and HV circuits. A fan is optional.

The vertical output amplifier is built around a 155-0080-00 hybrid (U450). CRT deflection plates are not distributed.

Other custom Tek ICs used include 155-0011-00 clock & chop blanking (U55), 155-0022-00 vertical channel switch (U214), 155-0022-00 trigger channel switch (U324),and the 7000 series readout system chips.

Modifications

Reduce ringing in vertical amplifier

Official Modification 36005 added a ground strap to the vertical amplifier to prevent >1 GHz oscillations.

Plugin backlight power

Like the other 76xx models, the 7603 has a linear supply which does not provide +5 V for lights (A9). There was an official Tek modification to add pushbutton illumination for plugins, which involves adding a regulator, but there is also a quick'n'dirty method from Rolynn Prechtl:

I've done multiple units the cheap and dirty way. No additional regulator, no pulling the LVPS to find a place to add extra components and the best part, no cost.
Look for P90 and P10 on the rear edge of the Main Interface ECB (left side as I remember).
Connect P10-1 (GND) P90-7 or 8 (GND).
Connect P10-2 (+5 V) to P90-4 (+5 V).
Two wires and you're done.
Have experienced no problems with the extra current demand from the +5V regulated supply.

Alternative addition of a simple buck regulator module is depicted in the modifications gallery below.

Prices

  Year 1973 1976 1980 1984 1990
Mainframe only Catalog price $1,600 $1,800 $2,260 $2,865 $4,235
In 2023 Dollars $11,100 $9,700 $8,400 $8,500 $9,900
Mainframe with 2 × 7A18 + 7B53 Catalog price $3,520 $3,955 $5,225 $6,880 $10,315
In 2023 Dollars $24,300 $21,300 $19,500 $20,300 $24,200

Pictures

Internal

Modifications

Components

Some Parts Used in the 7603

Part Part Number(s) Class Description Used in
155-0011-00 155-0011-00 Monolithic integrated circuit clock and chop blanking 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
155-0022-00 155-0022-00 155-0022-01 Monolithic integrated circuit analog multiplexer 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 7A18N 7B52 7B53N 7D10 7D11 7D12 NT-7000 P7001
155-0080-00 155-0080-00 Hybrid integrated circuit vertical output amplifier 7603 R7603 7613 R7613 7623 AN/USM-281C
2N3055 151-0140-00 Discrete component general-purpose silicon NPN power transistor TM504 TM506 TM5006 7603 7613 7623 7623A 7623B 7633
CA3046 156-0048-00 Monolithic integrated circuit transistor array 7104 7403N 7503 7B53A 7D12 DM502 FG504 S-52 Telequipment D34 7603 7613 7623 7633
T7400 154-0640-00 154-0640-05 154-0640-31 154-0640-10 154-0672-00 154-0673-00 CRT large-screen CRT (8 × 10 divisions of 1.22 cm) 7403N 7603 Telequipment D83

Custom ICs used in the 7000 series readout system

Page Model Part nos Description Designers Used in
155-0014-01 M019D 155-0014-00 155-0014-01 A/D converter Barrie Gilbert 7000 series readout system 7854 7934 7J20 7L5 P7001
155-0015-01 M020F 155-0015-00 155-0015-01 analog data switch Barrie Gilbert 7000 series readout system 7854 7934
155-0017-00 M025 155-0017-00 5 MHz decade counter Barrie Gilbert 7000 series readout system 7854 7934
155-0018-00 M026 155-0018-00 zeros logic control Les Larson 7000 series readout system 7934
155-0019-00 M027 155-0019-00 decimal point and spacing control Les Larson 7000 series readout system
155-0020-00 M028 155-0020-00 output assembler Les Larson 7000 series readout system
155-0021-00 M029C 155-0021-00 155-0021-01 timing generator Les Larson 7000 series readout system 7854 7934
155-0023-00 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 M161 155-0024-00 character generator (↓ < I / + - + C Δ >) Barrie Gilbert 7000 series readout system
155-0025-00 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 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 M164 155-0027-00 character generator (U N L Z Y P F J Q D) Barrie Gilbert 7000 series readout system