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Actually, there never was a Type C, but that name is sometimes
{{Plugin Sidebar
used as shorthand for the official "Type 53C" and "Type 53/54C" nomenclatures.
|manufacturer=Tektronix
|type=Type (53)C
|summary=Dual-trace 8.5 (24) MHz amplifier
|image=53-54c-crop.jpg
|caption=Tektronix Type C (later version)
|series=500-series scopes
|introduced=1954
|discontinued=1959
|manuals=
<!-- * [http://w140.com/tek_fcp/tek_type_c_factory_cal_proc.pdf Factory calibration procedure] -->
* [http://w140.com/tek-53_54c.pdf Tektronix Type 53/54C Manual (PDF, needs OCR)]
* [[Media:tek_type_c_fcp.pdf| Tektronix Type C Factory Calibration Procedure (PDF, OCR)]]
* [[Media:Tek 53c cal procedure.pdf|Tektronix Type C Calibration Procedure (PDF, OCR)]]
}}
:''Actually, there never was a Type C, but that name is sometimes used as shorthand for the official "Type 53C" and "Type 53/54C" nomenclatures.''


The Type 53C is a dual-trace plug-in for [[500-series scopes]].
The '''Tektronix Type 53C''' is a dual-trace plug-in for [[500-series scopes]].
It was [[introduced in 1954|introduced]] along with the [[531]] and [[535]] mainframes in 1954. It is very possibly the first dual-trace scope or plugin ever.
It was [[introduced in 1954|introduced]] along with the [[531]] and [[535]] mainframes in 1954.  
In those scopes (Tek never documented its performance in the 540's),
It is very possibly the first dual-trace scope or plugin ever.
its bandwidth is 8.5MHz, and like most letter-series plug-ins,
its maximum vertical sensitivity is 50mV/div.  Unlike the Type [[A]]
and Type [[B]], the Type C had the ability to invert the signal
before display.


Type 53C was replaced by Type 53/54C in [[introduced in 1956|1956]] when
==Specifications==
the [[541]] and [[545]] were introduced.  The Type 53/54C's
In the 53x scopes (Tek never documented its performance in the 540's), its bandwidth is 8.5 MHz, and like most letter-series plug-ins, its maximum vertical sensitivity is 50 mV/div.   
bandwidth is 24MHz in those scopesIn [[introduced in 1959|1959]] it
Unlike the Type [[A]] and Type [[B]], the Type C had the ability to invert the signal before display.
was replaced by Type [[CA]].


At 15 tubes, the Type 53/54C and Type CA have the highest
Type 53C was replaced by Type 53/54C in [[introduced in 1956|1956]] when the [[541]] and [[545]] were introduced.   
tube count of any letter-series plug-in.  Each channel consists
The Type 53/54C's bandwidth is 24 MHz in those scopes.  In [[introduced in 1959|1959]] it was replaced by [[CA|Type CA]].
of a [[6AK5]] cathode-follower driving a [[12AU6]] differential pair
which drives a [[6AU6]] differential pair.  The two channels
converge on a [[12AT7]] cross-coupled cathode-follower.  Four
more tubes, a [[6AL5]] and three 12AT7's, comprise a logic circuit
which determines which channel drives the output at any
given moment.  The options are A, B, CHOPPED, and ALT.


* http://w140.com/tek_fcp/tek_type_c_factory_cal_proc.pdf
==Internals==
* http://w140.com/tek-53_54c.pdf
 
At 15 tubes, the Type 53/54C and Type CA have the highest tube count of any letter-series plug-in.  Each channel consists of a [[6AK5]] cathode-follower driving a [[12AU6]] differential pair
which drives a [[6AU6]] differential pair. 
The two channels converge on a [[12AT7]] cross-coupled cathode-follower. 
Four more tubes, a [[6AL5]] and three 12AT7's, comprise a logic circuit which determines which channel drives the output at any given moment. 
The options are A, B, CHOPPED, and ALT.
 
==Links==
* [http://www.radiomuseum.org/r/tektronix_dual_trace_plug_in_pre_a.html 53C @ radiomuseum.org]
* [http://www.vintagetek.org/wp-content/uploads/2011/10/Tek-series-500-development.pdf How the Tek 500 series came together]
 
==Pictures==


<gallery>
<gallery>
Image:C_early_1.JPG|53C-Plugin´s Front
C_early_1.JPG|53C-Plugin´s Front
Image:C_early_2.JPG|53C-Plugin´s chassis
C_early_2.JPG|53C-Plugin´s chassis
Image:C_early_3.JPG|53C-Plugin´s chassis side
C_early_3.JPG|53C-Plugin´s chassis side
Image:C later 1.JPG|53/54C-Plugin´s front
C later 1.JPG|53/54C-Plugin´s front
Image:IMG 0949.JPG|53/54C-Plugin´s chassis
IMG 0949.JPG|53/54C-Plugin´s chassis
Image:C later 3.JPG|53/54C-Plugin´s chassis bottom
C later 3.JPG|53/54C-Plugin´s chassis bottom
Image:Tek c schem.png
Tek c schem.png | Schematic diagram
Tek 53-54c 1.jpg|53/54C
Tek 53-54c 2.jpg|53/54C
Tek 53-54c 3.jpg|53/54C
Tek 53-54c 4.jpg|53/54C
Tek 53-54c 5.jpg|53/54C
Tek 53-54c 6.jpg|53/54C
Tek 53-54c right.png|53/54C
Tek 53-54c left.jpg|53/54C
</gallery>
</gallery>
{{Parts|C}}


[[Category:500 series plugins]]
[[Category:500 series plugins]]