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The Tektronix 504 is a monolithic oscilloscope with a bandwidth of 450kHz [[introduced in 1960]]. It was introduced at the same time as the [[503]], and is mechanically and electrically identical, other than the vertical amplifier.  The 503 incorporates two identical phase matched amplifiers with true differential inputs to support X-Y operation, whereas the 504 contains a simple ground referenced vertical amplifier.  Due to the low bandwidth and need to keep the selling price low, neither the 503 or 504 include delay lines in the vertical signal path.
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|series=
|model=504
|summary=450 kHz scope
|image=Tek 504.JPG
|caption=Tektronix 504
|introduced=1960
|discontinued=1973
|designers=
|manuals=
* [[Media:070-224.pdf|Tektronix 504 Instruction Manual]]
}}
The '''Tektronix 504''' is a monolithic oscilloscope with a bandwidth of 450 kHz [[introduced in 1960]].  


Both scopes use the same CRTs.  The CRT circuit uses a single [[5642]] to generate the -3000V cathode voltage. 
It was introduced at the same time as the [[503]], and is mechanically and electrically identical apart from the vertical amplifier.
There is no post-deflection acceleration.
Triggering is done using a multivibrator made of a [[6DJ8]] tube. 
The vertical signal path has a [[6DJ8]] first stage,  
a BJT second stage, followed by the the output stage.
The vertical and horizontal output stages uses pairs of [[6CB6]] tubes.


The 504 was also offered in a rack mount version, the RM504.
The 504 was also offered in a rack mount version, the RM504.


{{BeginSpecs}}
{{Spec | Bandwidth  | DC to 450 kHz }}
{{Spec | Deflection | 5 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 | Sweep      | 1 μs/div to 500 ms/div, 1−2−5, variable 2.5:1, magnifier ×2, ×5, ×10, ×20, ×50 }}
{{Spec | Trigger    | Internal, 0.5 div; external 0.5 V }}
{{Spec | CRT        | [[T5030]], 3 kV (no post-deflection acceleration), P2 [[phosphor]] standard }}
{{EndSpecs}}


* [http://bama.edebris.com/download/tek/504/tek%20504.v6.pdf Tektronix 504 Manual (PDF)]
==Links==
* [http://www.museum-nt.de/objekte/tek_rm504.html Tektronix RM504] @ museum-nt.de
* [https://www.radiomuseum.org/r/tektronix_oscilloscope_rm504rm_50.html] @ radiomuseum.org


{{Documents|Link=504}}
{{Documents|Link=RM504}}
{{PatentLinks|504}}
{{PatentLinks|RM504}}
==Internals==
The 503 incorporates two identical phase matched amplifiers with true differential inputs to support X-Y operation,
whereas the 504 contains a simple ground-referenced vertical amplifier. 
Due to the low bandwidth and the need to keep the selling price low, neither the 503 or 504 include delay lines in the vertical signal path.
The trigger circuit is a multivibrator made of a [[6DJ8]] tube. 
The vertical signal path has a [[6DJ8]] first stage, a BJT second stage, followed by the output stage.
The vertical and horizontal output stages use pairs of [[6CB6]] tubes.
The CRT circuit uses a single [[5642]] to generate the –3 kV cathode voltage. 
==Pictures==
'''504'''
<gallery>
<gallery>
Image:Tek-504.jpg
Tek 504.JPG
Image:Tek-504-front.jpg
Tek-504.jpg
Image:Tek-504-right.jpg
Tek-504-front.jpg
Image:Tek-504-left.jpg
Tek-504-right.jpg
Tek-504-left.jpg
</gallery>
</gallery>
'''RM504'''
<gallery>
Rm504 white.jpg
Tek rm504 trace.jpg
Tek rm504 internal1.jpg
Tek rm504 internal2.jpg
</gallery>
==Components==
{{Parts|504}}
{{Parts|RM504}}
[[Category:Monolithic tube scopes]]
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