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The Tektronix Type 315 and 315D are single-channel oscilloscopes first [[introduced in 1953]].   
{{Oscilloscope Sidebar
They use [[3WP2]] 3-inch CRTs and are mechanically similar to  
|manufacturer=Tektronix
|series=300-series scopes
|model=315
|summary="Portable" tube scope
|image=315d front.jpg
|caption=Tektronix 315
|introduced=1952
|discontinued=(?)
|designers=Frank Hood;Dick Ropiequet;John Kobbe;Ted Goodfellow;Jim Morrow
|manuals=
'''315'''
* [[Media:Tek_315.pdf|Tektronix 315 Manual]]
'''315D'''
* [[Media:IM-315D.pdf|Tektronix 315D manual]]
* [[Media:tek_315d_fcp.pdf|Tektronix 315D factory calibration procedure]] (OCR)
* [[Media:tek_315d_instruction_manual.pdf|Tektronix 315D manual]] (bad-OCR)
* [[Media:Tek 315D irb.pdf|Tektronix 315D Instrument Reference Book]] (OCR)
* [[Media:315_Mods.pdf|Tektronix 315D Modification Summary]]
<!--
* [https://w140.com/tek_fcp/tek_type_315_factory_cal_proc.pdf Tektronix 315D factory calibration procedure]
-->
}}
The '''Tektronix Type 315 and 315D''' are single-channel oscilloscopes [[introduced in 1952|introduced in September 1952]].   
They use [[3WP2]] 3-inch CRTs. Later instruments use the Tek-made [[T3100]]-xx CRT.
 
== Historic Context ==
Tektronix engineer [[Frank Hood]] recollects:
<blockquote>
We started to move into the new Sunset plant in June of 1951. In the same year I started the design work on our first compact scope, the Type 315. This instrument had several innovative features. One was a sweep circuit designed by [[Dick Ropiequet]] which was several times more stable and accurate then any other then in use. With this circuit, the actual time of the sweep could be calibrated with such accuracy that we decided to start calling it a “TIME BASE”. The vertical amplifier was also more stable and accurate. A man in our test department, [[John Kobbe]], suggested a direct coupled unblanking circuit. Another employee, [[Ted Goodfellow]], a musician with ceramics as a hobby, suggested making a [[ceramic strips|ceramic strip]] with silvered notches to act as insulator and support for the components. This smaller scope had less space on the front panel for the necessary controls. A Machinist, [[Jim Morrow]], suggested combining some of the controls, by making them co-axial (that is, a shaft within a shaft and separate knobs.) We tried to purchase such controls but could find no one interesting in making them, so Jim machined sample controls. He even machined the dies to produce our own plastic knobs. All these suggestions were incorporated in the 315. Several patents were granted, which later led to a patent infringement suit which we brought against the Government (we eventually won the lawsuit)."
</blockquote>
 
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 5 MHz}}
 
{{EndSpecs}}
 
==Internals==
=== Case Design ===
The 315 is mechanically similar to  
early 500-series monolithic scopes such as the [[511|511A]].
early 500-series monolithic scopes such as the [[511|511A]].
The scope slides out of the case instead of having  
The scope slides out of the case instead of having  
removable side covers as were used in the 53x,
removable side covers as were used in the later 53x and
54x, 55x, 56x, 57x, and 58x designs.   
54x, and the 55x, 56x, 57x, and 58x designs.   
 
=== 3" CRT ===
The move to use a 3” CRT rather than a 5” was to produce a “portable” oscilloscope, which the 315-D was promoted as.  With dimensions considerably smaller than the 5” models and only weighing a modest 36 pounds, it offers a lot of performance in a small package.  In [[introduced_in_1956|1956]], Tek introduced a rack mount version, the 315R.  One has to wonder what the benefit of a 3" screen is when it was packaged as a rack sized instrument. Instruments originally used a purchased 3WP_ CRT. A mod was published in 1964 substituting the Tek-made [[T3100|T3100 CRT]], part numbers 154-0362-00 through 154-0366-00, depending on the phosphor.


The move to use a 3” CRT rather than a 5” was to produce a “portable” oscilloscope, which the 315-D was promoted as.  With dimensions considerably smaller than the 5” models and only weighing a modest 36 pounds, it offers a lot of performance in a small package.  In [[introduced_in_1956|1956]], Tek introduced a rack mount version, the 315R.  One has to wonder what the benefit of a 3" screen is when it was packaged is a rack sized instrument.
=== Delay Line ===
As with earlier 5” Tektronix scopes, the “D” suffix indicates the inclusion of
a delay line in the vertical signal path. 
The [[delay line]] resides between the pre-amplifier,  
where the trigger signal is picked off and the final vertical amplifier.   
The delay line allows time for the sweep to start and the unblanking
to turn the trace on slightly before the trace is deflected,  
so the user can see all of the rising edge of the signal which triggered the scope.   
The original [[511]], Tek’s first scope sold, did not have a delay line.  It was added with a few other circuit enhancements to become the 511-AD model.


As with earlier 5” Tektronix scopes, the “D” suffix indicates the inclusion of a delay line in the vertical signal path.  The delay line resides between the pre-amplifier, where the trigger signal is picked off and the final vertical amplifier.  The delay line allows time for the sweep to start and the unblanking to turn the trace on slightly before the trace is deflected, so the user can see all of the rising edge of the signal which triggered the scope.  The original 511, Tek’s first scope sold, did not have a delay line.  It was added with a few other circuit enhancements to become the 511-AD model.  The delay line was offered as a “delete” option on early scopes, with the version without the delay line selling for $50 less.  Apparently most customers ordered the delay line versions, and the 315 was the last scope introduced with the D suffix.  
== Pricing ==
Even so, the [http://bitsavers.org/pdf/tektronix/catalog/Tektronix_Catalog_1953-03.pdf 1953 catalog] which was the first the 315-D appeared in did not list the version without the delay line.  It is quite possible that no plain 315 models were ever sold.  
The delay line was offered as a “delete” option on early scopes, with the version without the delay line selling for $50 less.  Apparently most customers ordered the delay line versions, and the 315 was the last scope introduced with the D suffix.  
Even so, the [http://bitsavers.org/pdf/tektronix/catalog/Tektronix_Catalog_1953-03.pdf 1953 catalog], which was the first the 315-D appeared in, did not list the version without the delay line.  It is quite possible that no plain 315 models were ever sold.  


[http://w140.com/tek_fcp/tek_type_315_factory_cal_proc.pdf Tektronix 315D factory calibration procedure]
==Links==
* [[Media:Tektronix Photo Manual 1952.pdf| Tektronix Photo Manual 1952]]


[http://w140.com/tek_315d.pdf Tektronix 315D manual]
==Pictures==


===315 D===
<gallery>
<gallery>
Image:315d_front.jpg|Front view
Tek 315d front fl.jpg
Image:315d_right_case.jpg|Right view
315d_front.jpg|Front view
Image:315d_right_internal.jpg|Right internal
315d_right_case.jpg|Right view
Image:315d_top_internal.jpg|Top internal
315d_right_internal.jpg|Right internal
Image:315d_left_internal.jpg|Left internal
315d_top_internal.jpg|Top internal
Image:315d_bottom_internal.jpg|Bottom internal
315d_left_internal.jpg|Left internal
Image:315d_rear.jpg|Rear view
315d_bottom_internal.jpg|Bottom internal
Image:315r.jpg|Catalog photo of 315R
315d_rear.jpg|Rear view
Tek 315 lv ps.png|Low-voltage power supply
Tek 315 timebase.png|Time base
Tek 315 timebase range switch.png|Time base range switch
Tek 315 preamp.png|Preamp
Tek 315 calibrator.png|Calibrator
Tek 315 trig select and shape.png|Trigger selector and shaper
Tek 315 vertical amp2.png|Vertical amplifier
Tek 315 crt circuit2.png|CRT circuit
</gallery>
</gallery>
===315 R===
<gallery>
Tek 315r 1.jpg|315 R
Tek 315r 2.jpg|315 R
Tek 315r 3.jpg|315 R
Tek 315r 4.jpg|315 R
Tek 315r 5.jpg|315 R
315r.jpg|Catalog photo of 315R
Tek gray 315r 1.jpg|Gray 315R
Tek gray 315r 2.jpg|Gray 315R
Tek gray 315r 3.jpg|Gray 315R
Tek gray 315r 4.jpg|Gray 315R
Tek gray 315r 5.jpg|Gray 315R
Tek gray 315r 6.jpg|Gray 315R
Tek gray 315r 7.jpg|Gray 315R
Tek gray 315r 8.jpg|Gray 315R
Tek gray 315r 9.jpg|Gray 315R
Tek gray 315r 10.jpg|Gray 315R
Tek gray 315r 11.jpg|Gray 315R
Tek gray 315r 12.jpg|Gray 315R
</gallery>
==Components==
{{Parts|315}}
[[Category:Monolithic tube scopes]]
[[Category:Introduced in 1952]]
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