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.
|Bandwidth||100 MHz with 7A11, 7A16, 7A17, 7A24, 7A26; 110 MHz with 7A19, 70 MHz with 7A18|
|Fastest calibrated sweep||5 ns/Div|
|Vertical modes||Left / Alt / Add / Chop / Right|
|Trigger Source||Left / Vert Mode / Right|
|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|
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
- Detailed repair report @ amplifier.cd (German) / (translated)
- Tek 7603 @ barrytech.com
- Catalog page with specs
- Repair Report #2
- Repair Report #3
- Repair Report #4 - 7603 with 7D20
- EB5AGV's Tektronix R7603 / 7D20 page
- Picture of a completely disassembled 7603
- Håkan's 7603 PSU re-cap
- Zenwizard Studios - Tektronix 7603 Lab Check in and Calibration
Documents Referencing 7603
|Tekscope 1977 V9 N1.pdf||Article||Counter and Oscilloscope Combination Makes Difficult Measurements||Emory Harry||1977||DC505A • 7B53A • 7A18 • 7603|
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.
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.
|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|
Tektronix 7603, front view with display
Tektronix 7603, front view
7603 Option 8 (blue P11 phosphor)
7603 demonstrating use of front panel calibrator
7603, left side - center left: vertical amplifier
7603, right side - left: calibrator, center left: readout, center right: cover of HV board
7603, top view - top: Z axis board, bottom: horizontal amplifier board
HV board (below SN B330000)
HV board (later version, DC restorer circuits on daughter boards, neons)
Interior view of rear panel showing part of LV regulator board (version without fan)
Rear view with LV regulator board flipped out (version without fan)
Low voltage regulator board
Low voltage regulator board fixed for maintenance
Bottom view of backplane. Backplane interconnect board is seen in center, vertical interface and trigger selector piggyback boards on left/top left, logic board on right.
Logic board (normally situated on back of main interconnect facing the PSU)
Trig Select and Vertical Interface boards
Backplane interconnect without Vertical Interface and Trigger Selector piggyback boards
Pushbutton illumination supply using a small step-down regulator module
Some Parts Used in the 7603