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The Tektronix Type 503 is a monolithic oscilloscope [[introduced in 1960]] specializing in X-Y mode but also containing a sweep circuit.  It features two identical phase matched amplifiers with true differential inputs.  The scope has a bandwidth specification of 450 kHz and sensitivity to 1mV per centimeter.  The 503 and [[504]] were low priced scopes for their time but provided the same quality and precision of their higher handwidth siblings.  The standard version 503 utilized a P2 phosphor CRT that provides a slightly longer trace decay time for ease of photographing the display.  A large market for the scope was in electronics labs of educational institutions.  The differential inputs are useful for entry level students to experiment with observing voltages not referenced to ground.
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|series=
|model=503
|summary=450 kHz differential-input scope
|image=Tek 503 corner.jpg
|caption=Tektronix 503
|introduced=1960
|discontinued=1973
|designers=
|manuals=
* [[Media:070-218.pdf|Tektronix 503 manual, -00]] (OCR)
* [[Media:070-0218-01.pdf|Tektronix 503 manual, -01]] (OCR)
* [[Media:070-0314-01.pdf|RM503 manual, -01]] needed
* [[Media:Tek 503 fcp.pdf|503 Factory Calibration Procedure]] (OCR)
* [[Media:Tek 503 irb.pdf|503 Instrument Reference Book]]
* [[Media:Tek 503 cal outline.pdf|503 Calibration Outline]]
<small>
'''Alternate'''
* [https://bama.edebris.com/download/tek/503/503late.pdf Tektronix 503 manuals (2 versions)] @ BAMA
</small>
}}
The '''Tektronix Type 503''' is a low-cost, low-bandwidth monolithic oscilloscope [[introduced in 1960]] specializing in X-Y mode but also containing a sweep circuit.  It features differential signal inputs.


The 503 is mostly a vacuum tube design with a differential transistor stage following the differential input amplfiers.  The 503 does not use post deflection acceleration, resulting in the CRT cathode operating at -3000 V. The power supply design is unique in that, unlike other scopes where the high frequency transformer only generates the CRT operating voltages, in the 503 it generates all the operating voltages other than the two filament circuits which are supplied by the AC mains power transformer.
There is a similar sister model, the [[504]], with single-ended inputs. A rack-mount version, the ''RM503'',
was also available.


A main virtue of the 503 is its low bandwidth which enables it to operate at high sensitivities while not responding to interference from broadcast transmitter RF fields and is therefore useful for biomedical experimenting as well.
The 503 features two identical phase matched amplifiers with true differential inputs. 
The scope has a bandwidth specification of 450 kHz and sensitivity to 1 mV/cm.   
Due to is its low bandwidth, the 503 can operate at high sensitivities while not responding to interference from broadcast transmitter RF fields, making it suitable for biomedical work.


The rack mount version of the 503 is the RM503.
In 1960, the 503 cost $625 ($6,600 in 2024 dollars) versus, for example, [[516]] which cost $1000 (2024: $10,600).


[http://bama.edebris.com/download/tek/503/503late.pdf Tektronix 503 manual]
A large market for the 503 was in electronics labs of educational institutions.
The differential inputs are useful for junior students to experiment with observing voltages not referenced to ground.


[http://w140.com/tek_fcp/tek_type_503_factory_cal_proc.pdf Tektronix 503 factory calibration procedure]
{{BeginSpecs}}
{{Spec | Bandwidth  | DC to 450 kHz (AC coupled 10 Hz) }}
{{Spec | Deflection | 1 mV/div to 20 V/div, 1–2–5, and 2.5:1 variable }}
{{Spec | Inputs    | 1 MΩ // 47 pF; max. 350 V (DC + peak AC) }}
{{Spec | CMRR      | 100:1 in 1 mV/div to 200 mV/div, 30:1 above (all at ≤50 kHz) }}
{{Spec | Phase      |  <1° to 450 kHz in 1 mV/div to 200 mV/div (equal X and Y sensitivity, variable in CAL, like polarities, DC coupling); <2° to 50 kHz in 500 mv/div to 20 V/div) }}
{{Spec | Sweep      | 1 μs/div to 5 s/div, 1−2−5, variable 2.5:1, magnifier ×2, ×5, ×10, ×20, ×50 }}
{{Spec | Trigger    | Internal, 0.5 div from 50 Hz to 50 kHz, increasing to 2 div at 450 kHz; external 0.5 V from 50 Hz to 450 kHz }}
{{Spec | CRT        | [[T5030]], 3 kV (no post-deflection acceleration), P2 [[phosphor]] standard }}
{{EndSpecs}}


==Links==
* [https://youtube.com/watch?v=GDZS1yEVqko Tektronix Type 503 Electrical Troubleshooting And Repair] by Mr Carlson's Lab @ YouTube
{{Documents|Link=503}}
{{PatentLinks|503}}
==Internals==
The 503 is mostly a vacuum tube design with a differential transistor stage following the differential input amplifiers. 
The power supply design is unique in that unlike other scopes where the high frequency transformer only generates the CRT operating voltages,
in the 503 it generates all the operating voltages other than the two filament circuits which are supplied by the AC mains power transformer.
It is basically a tube-based (secondary)  switch-mode power supply (SMPS). 
A [[6DQ6]] power pentode, V620, feeds switched primary current to transformer T620.
The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate efficiently with much lower core mass than would be required for a transformer operating at mains frequency.
==Pictures==
'''503'''
<gallery>
<gallery>
Image"RM503_5.JPG|RM503 front panel 1
Tek 503 corner.jpg
Image:RM503 front.jpg|RM503 front panel 2
Tek 503 trace.jpg
Image:RM503 1.JPG|RM503 top view
Tek_503_1.jpeg
Image:RM503 bottom.jpg|RM503 bottom view 1
Tek 503 atten.jpg   |Compensated input attenuator
Image:RM503 3.JPG|RM503 bottom view 2
Tek_503_controls.jpg
Image:RM503 back.jpg|RM503 rear panel
Tek 503 right.jpg   |503 right side
Image:Tek 503 b2.jpg|503
Tek_503_2.jpeg      | 503 left side
Tek 503 top.jpg     | 503 top
Tek 503 rear.jpg   | 503 rear
Tek 503 trace d.jpg
</gallery>


'''RM503'''
<gallery>
Tek rm503 trace.jpg
RM503 5.JPG      | RM503 front panel 1
RM503 front.jpg  | RM503 front panel 2
RM503 1.JPG      | RM503 top view
RM503 bottom.jpg  | RM503 bottom view 1
RM503 3.JPG      | RM503 bottom view 2
RM503 back.jpg    | RM503 rear panel
RM503 4.JPG      | RM503 with rear panel input connector option
Tek rm503 34.jpg
Tek rm503 34r.jpg
Gray rm503.jpg
tek_black_rm503_1.jpg
tek_black_rm503_2.jpg
Tek rm503 flat trace.jpg
Honeysuckle Creek tracking station - Receivers.jpg | RM503 scopes in the receiver consoles at Apollo tracking station Honeysuckle Creek, Australia –  https://honeysucklecreek.net/station/ops_areas.html
</gallery>
<!--
  Unused images:
  Tek 503 b1.jpg|503
  Tek 503 b2.jpg |503
  RM503 top.jpg|RM503
  RM503 closeup.jpg|RM503
-->
'''Schematics'''
<gallery>
503 ps.png|power supply schematic
</gallery>


</gallery>
==Components==
Unused images:
{{Parts|503}}
Image:Tek 503 b1.jpg|503
 
Image:RM503 top.jpg|RM503
[[Category:Monolithic tube scopes]]
Image:RM503 closeup.jpg|RM503

Latest revision as of 03:22, 24 June 2024

Tektronix 503
450 kHz differential-input scope
Tektronix 503

Produced from 1960 to 1973

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 503 is a low-cost, low-bandwidth monolithic oscilloscope introduced in 1960 specializing in X-Y mode but also containing a sweep circuit. It features differential signal inputs.

There is a similar sister model, the 504, with single-ended inputs. A rack-mount version, the RM503, was also available.

The 503 features two identical phase matched amplifiers with true differential inputs. The scope has a bandwidth specification of 450 kHz and sensitivity to 1 mV/cm. Due to is its low bandwidth, the 503 can operate at high sensitivities while not responding to interference from broadcast transmitter RF fields, making it suitable for biomedical work.

In 1960, the 503 cost $625 ($6,600 in 2024 dollars) versus, for example, 516 which cost $1000 (2024: $10,600).

A large market for the 503 was in electronics labs of educational institutions. The differential inputs are useful for junior students to experiment with observing voltages not referenced to ground.

Key Specifications

Bandwidth DC to 450 kHz (AC coupled 10 Hz)
Deflection 1 mV/div to 20 V/div, 1–2–5, and 2.5:1 variable
Inputs 1 MΩ // 47 pF; max. 350 V (DC + peak AC)
CMRR 100:1 in 1 mV/div to 200 mV/div, 30:1 above (all at ≤50 kHz)
Phase <1° to 450 kHz in 1 mV/div to 200 mV/div (equal X and Y sensitivity, variable in CAL, like polarities, DC coupling); <2° to 50 kHz in 500 mv/div to 20 V/div)
Sweep 1 μs/div to 5 s/div, 1−2−5, variable 2.5:1, magnifier ×2, ×5, ×10, ×20, ×50
Trigger Internal, 0.5 div from 50 Hz to 50 kHz, increasing to 2 div at 450 kHz; external 0.5 V from 50 Hz to 450 kHz
CRT T5030, 3 kV (no post-deflection acceleration), P2 phosphor standard

Links

Documents Referencing 503

(no results)

Internals

The 503 is mostly a vacuum tube design with a differential transistor stage following the differential input amplifiers.

The power supply design is unique in that unlike other scopes where the high frequency transformer only generates the CRT operating voltages, in the 503 it generates all the operating voltages other than the two filament circuits which are supplied by the AC mains power transformer. It is basically a tube-based (secondary) switch-mode power supply (SMPS). A 6DQ6 power pentode, V620, feeds switched primary current to transformer T620. The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate efficiently with much lower core mass than would be required for a transformer operating at mains frequency.

Pictures

503

  • Compensated input attenuator

    Compensated input attenuator

  • 503 right side

    503 right side

  • 503 left side

    503 left side

  • 503 top

    503 top

  • 503 rear

    503 rear

RM503

  • RM503 front panel 1

    RM503 front panel 1

  • RM503 front panel 2

    RM503 front panel 2

  • RM503 top view

    RM503 top view

  • RM503 bottom view 1

    RM503 bottom view 1

  • RM503 bottom view 2

    RM503 bottom view 2

  • RM503 rear panel

    RM503 rear panel

  • RM503 with rear panel input connector option

    RM503 with rear panel input connector option

  • RM503 scopes in the receiver consoles at Apollo tracking station Honeysuckle Creek, Australia – https://honeysucklecreek.net/station/ops_areas.html

    RM503 scopes in the receiver consoles at Apollo tracking station Honeysuckle Creek, Australia – https://honeysucklecreek.net/station/ops_areas.html

Schematics

  • power supply schematic

    power supply schematic

Components

Some Parts Used in the 503

Part Part Number(s) Class Description Used in
5642 154-0051-00 • 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 • 310A • 316 • 317 • 360 • 453 • 502 • 502A • 503 • 504 • 506 • 513 • 515 • 516 • 524 • 529 • RM529 • 533 • 533A • 535 • 536 • 543 • 543A • 543B • 545 • 545A • 545B • 547 • 551 • 555 • 556 • 560 • 561 • 561A • 561S • 564 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 647 • 647A
5651 154-052 • 154-0052-00 • 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 • 160 • 310 • 310A • 502 • 503 • 504 • 511A • 512 • 516 • 517 • 524 • 526 • 531 • 531A • 535 • 536 • 541 • 541A • 543 • 543A • 543B • 545 • 545A • 545B • 570 • 549 • 581 • 581A • 585 • 585A
6AL5 154-016 • 154-0016-00 • 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 • 181 • 190 • 1M1 • 310 • 310A • 315 • 316 • 317 • 3B1 • 3B1S • 3B2 • 3B3 • 3B5 • 502 • 502A • 503 • 511 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 535A • 545 • 545A • 549 • 551 • 565 • 570 • 581 • 581A • 585 • 585A • C • T • Telequipment D52 • Telequipment D56 • Telequipment S52
6BC7 154-0232-00 Vacuum Tube (Diode) triple diode 503 • 504 • 565 • 67 • 2B67
6BJ7 154-0453-00 Vacuum Tube (Diode) triple diode 503 • 526 • 565
6BL8 154-0278-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 67 • 2B67 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 503 • 504 • 506 • 516 • 549 • 561 • 561A • 561S • 564 • 565 • 567 • Telequipment D52 • Telequipment D56 • Telequipment S31 • Telequipment S32 • Telequipment S32A • Telequipment S51 • Telequipment S52
6CB6A 154-0030-00 Vacuum Tube (Pentode) pentode 105 • 112 • 316 • 317 • 503 • 504 • 513 • 517 • 517A • 541 • 535 • 545 • 63 • 2A63
6DJ8 154-0187-00 • 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 • 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4
6DK6 154-0149-00 • 154-0367-00 Vacuum Tube (Pentode) high-frequency miniature pentode 180 • 503 • 513 • 514 • 541 • 543 • 535 • 545 • 545A • 551 • 555
6DQ6 154-0277-00 Vacuum Tube (Pentode) power pentode 503 • 504
8393 154-0461-00 Vacuum Tube (Triode) Nuvistor triode 453 • 454 • 1A6 • 1A7 • 503
T5030 154-0264-00 • 154-0265-00 • 154-0266-00 • 154-0267-00 • 154-0341-00 CRT CRT 503 • 504 • 560 • 561 • 661
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