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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 RM502A.  There 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 rm 502a front.jpg|RM 502A
Tek rm502a 2 2.jpg | RM502A rear
Image:Rm 502a display.jpg|RM 502A display
Tek rm 502a front.jpg|RM 502A
Rm 502a display.jpg|RM 502A display
Rm502a bottom2.jpg|RM 502A bottom
Rm502a transformer wiring.jpg|RM 502A transformer wiring
Rm502a top.jpg|RM 502A top
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]]
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