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[[Image:Tek_502.jpg|200px|thumb|right|Image magnified out from a flyer]]
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|series=
|model=502
|summary=1 MHz dual beam differential scope
|image=Tek 502 with x-y display.jpg
|caption=Tek 502 front (with Single Sweep Mod 104)
|introduced=1958
|discontinued=1973
|designers=Gary Vance
|manuals=
'''502'''
* [[Media:IM-502-1.pdf|502 (early) Instruction]]
* [[Media:070-090.pdf|502 (late) Instruction]]
'''502A'''
* [[Media:070-382.pdf|502A Instruction]]
* [[Media:070-0382-02.pdf|502A/RM502A (late) Instruction)]]
'''Calibration'''
* [[Media:Tek 502a fcp sn31k-up june 1969.pdf | Tektronix 502A sn 31,000-up Factory Calibration Procedure, June 1969]]
* [[Media:Tek 502a cal outline.pdf|502A Calibration Outline]]
}}
The '''Tektronix 502''' is a dual-beam oscilloscope [[introduced in 1958]], followed by the 502A in 1963. There is also a rack-mount model, the RM502A.


The 502 is a dual-beam oscilloscope with a high sensitivity of 100 or 200 microvolts/cm,
Both beams have differential inputs.  The horizontal deflection plates are common to both beams.   
depending on the mode whether differential inputs are used.
At 200uV/cm the bandwidth is only 100kHz but at 200mV/cm it rises to 1MHz.
There is a 502, a 502A, and an RM502AThere is a transistor-regulated heater supply build in.


Price at July 1959 was $825.
Mod 104 on a 502 provides single sweep lockout. This feature is standard on the 502A, which also has beam finder switches for each channel.


Mod 104 on a 502 provides single sweep lockout.
A recessed switch in the left side panel allows the upper beam amplifier to be connected to the horizontal deflection plates for single-beam X-Y operation, providing a differential X input with the same sensitivity as the Y channel.  The upper beam is positioned off screen in this mode.


* [http://w140.com/tek_502.pdf Tektronix 502 Manual (PDF)]
If the combination of time base setting and magnification selector results in a sweep faster than 1 μs/div, the horizontal scale is not calibrated, and a lamp on the front panel lights up to remind the operator of that.
* [http://bama.edebris.com/download/tek/502a/tek%20502a.v6.pdf Tektronix 502A Manual (PDF)]
{{BeginSpecs}}
{{Spec | Deflection | 100 μV/cm to 20 V/cm, 1−2−5, ±3% }}
{{Spec | Bandwidth | 1 MHz @ 200 mV/cm and above; 400 kHz @ 50 mV/cm, 200 kHz @ 5 mV/cm, 100 kHz @ 200 μV/cm }}
{{Spec | CMRR | 502A: 40,000:1 @ 100 mV/cm and 1 kHz }}
{{Spec | Input impedance | 1 MΩ // 47 pF }}
{{Spec | Sweep | 1 μs/cm to 5 s/cm, 1−2−5, ±3%; magnifier ×2, ×5, ×10 or ×20 }}
{{Spec | CRT | Early 502: Type [[T60P2]]/[[T502P2]]/[[T5020P2]];<br />Late 502, 502A: Type [[T5021P2]];<br />(P1, P7 or P11 were available as options)<br />10 vertical and 10 horizontal 1 cm divisions<br />3 kV acceleration }}
{{Spec | Dimensions | 597 mm (23½") × 286 mm (11¼") × 381 mm (15") L×W×H }}
{{spec | Weight | 23.6 kg (52lb) }}
{{EndSpecs}}


==Links==
{{Documents|Link=502}}
{{Documents|Link=502A}}
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/502A.htm Tektronix 502A] @ amplifier.cd (many internal pictures)
* [https://youtu.be/0D-z6_M76Ls Tektronix 502A internals] @ youtube (German)
==Prices==
{| class="wikitable"
|-
! Year
! 1959
! 1961
! 1963 (A)
! 1971 (A)
|-
! Catalog price
|align=right|  $825
|align=right|  $825
|align=right| $1,050
|align=right| $1,265
|-
! In 2023 Dollars
|align=right| $8,700
|align=right| $8,500
|align=right| $10,500
|align=right| $9,600
|-
|}
==Internals==
The −150 V supply uses a [[5651]] voltage reference tube as its reference.
The 6.2 V<sub>DC</sub> heater supply for the tubes in the first stage differential amplifier is transistor-regulated. 
This heater supply uses the −150 V supply as its reference. 
There is no post-deflection acceleration. The CRT cathode voltage is −2.9 kV.
The early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer [[120-114]]). 
Later models (1959+, see [[Media:070-090.pdf|070-090]]) and the 502A have separate supplies for the two CRT cathodes (HV transformer [[120-150]]).
This improvement allows slight differences in horizontal CRT sensitivity between
the two beams to be cancelled out in step 8 of the calibration procedure.
Later 502A models have a solid state (plus [[nuvistor]]) input stage,
a [[6DJ8]] as the deflection amplifier, and transistors as amplifiers and emitter followers (only in the newest version).
The 502 has a 123 °F (50.5 °C) [[thermal cutoff]] switch.
==Pictures==
===502===
<gallery>
Tek 502 with x-y display.jpg    | 502 with (single-beam) X-Y display
Tek_502_front.jpg                | 502 Mod.104 (single sweep), front
Tek 502 front fl.jpg            | 502 Mod.104 (single sweep), front from lower left
Tek 502 left.jpg                | 502 left interior
Tek 502 right.jpg                | 502 right interior
502 amplifier shock mount.jpg    | rubber shock mount of amplifier sub-chassis
Tek 502 bottom.jpg              | 502 bottom
Tek 502 trace.jpg                | 502 trace
Tek 502 trace2.jpg              | 502 trace
Tek 502 front panel wo knobs.jpg | 502 front panel without knobs
502 power supply operating.jpg  | 502 power supply section in operation
</gallery>
===502A===
<gallery>
Wellenkino_502a_011.jpg|502A
Tek 502a right internal.jpg|502A right internal
Tek 502a right.jpg|502A right
Tek 502a left.jpg|502A left
Tek 502a rear.jpg|502A rear
502A_Solidstate.JPG| Solid-state input stage with two 6DJ*
Tek 502a sn25997 to 30999 vert amp.jpg|502A vertical amp sn 25,997 to 30,999
</gallery>
===RM502A===
<gallery>
<gallery>
Image:Tek_502_front.jpg|502 front view
Tek rm502a 2 1.jpg | RM502A
Image:Tek 502a block.png|502A block diagram
Tek rm502a 2 2.jpg | RM502A rear
Image:Tek rm 502a front.jpg|RM 502A
Tek rm 502a front.jpg|RM 502A
Image:Rm 502a display.jpg|RM 502A display
Rm 502a display.jpg|RM 502A display
Image:Rm502a bottom2.jpg|RM 502A bottom
Rm502a bottom2.jpg|RM 502A bottom
Image:Rm502a transformer wiring.jpg|RM 502A transformer wiring
Rm502a transformer wiring.jpg|RM 502A transformer wiring
Image:Rm502a top.jpg|RM 502A top
Rm502a top.jpg|RM 502A top
Image:Rm502a floating pre.jpg|RM 502A vibration-isolated vertical amp
Rm502a floating pre.jpg|RM 502A vibration-isolated vertical amp
</gallery>
</gallery>
=== Third version 502A, serial number ≥31,000 ===
<gallery>
Tek 502a last generation attenuator.jpg|top side lower beam input amp and attenuator, bottom side of upper beam vert input board
RM502A Left Side with HV covers.JPG|late model RM502A
RM502A Right Side.JPG|late model RM502A
RM502A Bottom.JPG|late model RM502A
RM502A Left Side with covers and bracket removed.JPG|late model RM502A
RM502A Upper Beam Vertical Preamp.JPG|late model RM502A
RM502A Top, looking onto the lower beam preamp.JPG|late model RM502A
RM502A Top.JPG|late model RM502A
</gallery>
===Diagrams===
<gallery>
Tek 502a block.png              | 502A block diagram
Tek-502a vert.png              | 502A vertical amplifier
Tek 502 crt circuit.png        | Early 502 CRT circuit, [[120-114]] transformer (secondary transformer pin numbers incorrect)
Tek 502 crt circuit 070-090.png | Later 502 CRT circuit, [[120-150]] transformer
Tek 502a hvps.png              | 502A CRT circuit, [[120-150]] transformer
502-mountain-climber.png        | [[Tektronix Cartoons|Cartoon]] in schematic: Mountain Climber
</gallery>
===Applications===
<gallery>
Tek 502A in Physiology Lab.jpg | Tek 502A in a Physiology lab
</gallery>
==Components==
{{Parts|502}}
{{Parts|502A}}
[[Category:Dual beam scopes]]
[[Category:Monolithic tube scopes]]

Latest revision as of 15:20, 9 March 2024

Tektronix 502
1 MHz dual beam differential scope
Tek 502 front (with Single Sweep Mod 104)

Produced from 1958 to 1973

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 502 is a dual-beam oscilloscope introduced in 1958, followed by the 502A in 1963. There is also a rack-mount model, the RM502A.

Both beams have differential inputs. The horizontal deflection plates are common to both beams.

Mod 104 on a 502 provides single sweep lockout. This feature is standard on the 502A, which also has beam finder switches for each channel.

A recessed switch in the left side panel allows the upper beam amplifier to be connected to the horizontal deflection plates for single-beam X-Y operation, providing a differential X input with the same sensitivity as the Y channel. The upper beam is positioned off screen in this mode.

If the combination of time base setting and magnification selector results in a sweep faster than 1 μs/div, the horizontal scale is not calibrated, and a lamp on the front panel lights up to remind the operator of that.

Key Specifications

Deflection 100 μV/cm to 20 V/cm, 1−2−5, ±3%
Bandwidth 1 MHz @ 200 mV/cm and above; 400 kHz @ 50 mV/cm, 200 kHz @ 5 mV/cm, 100 kHz @ 200 μV/cm
CMRR 502A: 40,000:1 @ 100 mV/cm and 1 kHz
Input impedance 1 MΩ // 47 pF
Sweep 1 μs/cm to 5 s/cm, 1−2−5, ±3%; magnifier ×2, ×5, ×10 or ×20
CRT Early 502: Type T60P2/T502P2/T5020P2;
Late 502, 502A: Type T5021P2;
(P1, P7 or P11 were available as options)
10 vertical and 10 horizontal 1 cm divisions
3 kV acceleration
Dimensions 597 mm (23½") × 286 mm (11¼") × 381 mm (15") L×W×H
Weight 23.6 kg (52lb)

Links

Documents Referencing 502

(no results)

Documents Referencing 502A

Document Class Title Authors Year Links
Service Scope 42 Feb 1967.pdf Article Simplify Waveform Measurements 1967

Prices

Year 1959 1961 1963 (A) 1971 (A)
Catalog price $825 $825 $1,050 $1,265
In 2023 Dollars $8,700 $8,500 $10,500 $9,600

Internals

The −150 V supply uses a 5651 voltage reference tube as its reference.

The 6.2 VDC heater supply for the tubes in the first stage differential amplifier is transistor-regulated. This heater supply uses the −150 V supply as its reference.

There is no post-deflection acceleration. The CRT cathode voltage is −2.9 kV.

The early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer 120-114). Later models (1959+, see 070-090) and the 502A have separate supplies for the two CRT cathodes (HV transformer 120-150). This improvement allows slight differences in horizontal CRT sensitivity between the two beams to be cancelled out in step 8 of the calibration procedure.

Later 502A models have a solid state (plus nuvistor) input stage, a 6DJ8 as the deflection amplifier, and transistors as amplifiers and emitter followers (only in the newest version).

The 502 has a 123 °F (50.5 °C) thermal cutoff switch.

Pictures

502

502A

RM502A

Third version 502A, serial number ≥31,000

Diagrams

Applications

Components

Some Parts Used in the 502

Part Part Number(s) Class Description Used in
120-117 120-117 Discrete component power transformer 502
12AT7 154-0039-00 Vacuum Tube (Dual Triode) dual high-gain triode 161 180 310 310A 315 316 360 502 502A 511A 512 513 513D 514 514AD 514D 516 524 529 RM529 544 546 547 556 565 570 3A2 75 3A75 1M1 A B C G H K L ML M N K R S Z Keithley 610B
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 181 190 310 310A 316 317 3C66 502 502A 507 511A 512 516 517 517A 524 526 535 536 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825
12B4 154-044 154-0044-00 Vacuum Tube (Triode) power triode 126 310 310A 316 317 502 502A 524 526 541 541A 535 535A 545 545A 546 547 570 549 551 555 513 581 581A 585 585A Keithley 610
2N301 151-0001-00 Discrete component germanium PNP power transistor 502 502A
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
5AR4 154-0168-00 Vacuum Tube (Dual Rectifier) dual rectifier 502 502A 160
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
6AN8 154-078 154-0078-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 310 310A 316 317 360 502 502A 516 517 517A 526 565 570 575 N
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 160 181 190 60 2A60 72 3A72 3C66 310 310A 316 317 360 502 502A 506 511 511A 512 513 516 517 517A 524 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q
6BW4 154-0119-00 Vacuum Tube (Dual Diode) dual diode 126 502 502A 524 575
6CZ5 154-0167-00 Vacuum Tube (Pentode) power pentode 317 502 506 526 555 561 561A 561S 564 565 567
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
8056 154-0417-00 Vacuum Tube (Triode) low-voltage Nuvistor triode 422 502 W 1S1 3A7 3S3 3T4 5T3 10A1
T502 154-0144-00 154-144 154-0170-00 154-170 154-0172-00 154-172 154-0173-00 154-173 154-0269-00 154-269 154-0270-00 154-270 154-0271-00 154-271 154-0272-00 154-272 154-0273-00 154-273 154-0274-00 154-274 154-0275-00 154-275 154-0276-00 154-276 154-0348-00 CRT dual-beam CRT 502


Some Parts Used in the 502A

Part Part Number(s) Class Description Used in
12AT7 154-0039-00 Vacuum Tube (Dual Triode) dual high-gain triode 161 180 310 310A 315 316 360 502 502A 511A 512 513 513D 514 514AD 514D 516 524 529 RM529 544 546 547 556 565 570 3A2 75 3A75 1M1 A B C G H K L ML M N K R S Z Keithley 610B
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 181 190 310 310A 316 317 3C66 502 502A 507 511A 512 516 517 517A 524 526 535 536 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825
12B4 154-044 154-0044-00 Vacuum Tube (Triode) power triode 126 310 310A 316 317 502 502A 524 526 541 541A 535 535A 545 545A 546 547 570 549 551 555 513 581 581A 585 585A Keithley 610
151-0261-00 151-0261-00 Discrete component dual PNP transistor AM501 AM502 CG5001 CG551AP FG501 FG502 FG503 OF150 OF151 OF152 OF235 OS261 RM502A R1140 R5030 R5031 R7912 067-0679-00 067-0807-00 1101 1140A 1141 1142 1350 145 1450 1480 1481 1482 1485 1501 1801 1900 1910 1980 213 26A1 26A2 2620 285 3A9 3A10 3S1 3S2 3S5 3S6 432 434 4501 454 4601 4602 4610 4612 4620 4632 4634 4701 475 492 492A 492AP 494 494P 496 496P 5A13N 5A20N 5A21N 5A22N 5A26 5L4N 502A 5030 5031 576 690SR 7A22 7A29 7B51 7B71 7J20 7L5 7S11 7S12 7912AD
2N301 151-0001-00 Discrete component germanium PNP power transistor 502 502A
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
5AR4 154-0168-00 Vacuum Tube (Dual Rectifier) dual rectifier 502 502A 160
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
6AN8 154-078 154-0078-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 310 310A 316 317 360 502 502A 516 517 517A 526 565 570 575 N
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 160 181 190 60 2A60 72 3A72 3C66 310 310A 316 317 360 502 502A 506 511 511A 512 513 516 517 517A 524 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q
6BW4 154-0119-00 Vacuum Tube (Dual Diode) dual diode 126 502 502A 524 575
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
6DT5 154-0302-00 Vacuum Tube (Pentode) power pentode 502A
T5021 154-0245-00 154-245 154-0246-00 154-246 154-0247-00 154-247 154-0248-00 154-248 154-0249-00 154-249 154-0250-00 154-250 154-0280-00 154-280 154-0281-00 154-280 CRT dual-beam CRT 502A