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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar
title=Tektronix 511|
|manufacturer=Tektronix
summary=10 MHz Tube scope<br />''First Tektronix product''|
|series=
image=Tek 514d front.jpg |
|model=511
caption=Tektronix 514 front |
|summary=10 MHz Tube scope<br />''First Tektronix oscilloscope''
years=1947 - 1953 |
|image=Tek 511 1.jpg
manuals=.* [http://w140.com/tek_511.pdf Tektronix 511 Manual (PDF)]
|caption=Tektronix 511 front
* [http://bama.edebris.com/download/tek/511aearly/Tek%20511A%20Pre%20SN2869.pdf Tektronix 511A Manual pre SN 2869 (PDF)]
|introduced=1947
* [http://bama.edebris.com/download/tek/511alater/Tek%20511A%20SN%202869-5099.pdf Tektronix 511A Manual SN 2869-5099 (PDF)]
|discontinued=1953
* [http://richardsears.wordpress.com/2012/01/07/near-the-beginning-of-an-era-the-tektronix-511a/ Richard Sears' 511A Page]
|designers=Frank Hood;Logan Belleville;Howard Vollum
* [http://w140.com/1947+Tektronix_Catalog.pdf Tektronix 1947 Catalog with 511 (PDF)]
|manuals=
* [[Media:IM-511.pdf|Tektronix 511/511A Manual]] (OCR, includes S/N 5100+ information)
* [[Media:IM-511A-1.pdf|Tektronix 511A Manual SN <2869]] (OCR)  
* [[Media:IM-511A-2.pdf|Tektronix 511A Manual revised in 1951 for SN 2869-5099]] (OCR)
* [https://richardsears.wordpress.com/2012/01/07/near-the-beginning-of-an-era-the-tektronix-511a/ Richard Sears' 511A Page]
* [[Media:1947_Tektronix_Catalog.pdf|Tektronix 1947 "Catalog" (511 only)]]
}}
The 511 was Tektronix' '''first oscilloscope''', [[introduced in 1947|introduced in June 1947]] but only the second product released by the young company – the first was the [[101|Type 101 Video Calibrator]].
 
According to TekWeek March 23, 1984, ''"511" stood for 5-inch tube, 1 channel, 1st model.  It sold for $795<sup>[Note 1]</sup>, compared to $1,800 for a two-piece Dumont scope that was mostly pre-war technology.''
 
An improved version, the 511A, was [[introduced in 1948|introduced in November 1948]].  Major improvements included a regulated power supply for CRT and calibrator (s.b.)  


}}
[[Howard Vollum]] was directly involved with the design of the 511.
The 511 was '''Tek's first product''', [[introduced in 1947|introduced in June 1947]].
 
A revised version, the 511A, was [[introduced in 1950]]. [[Charles Vollum]] was directly involved with the design of the 511.   
{{BeginSpecs}}
{{Spec | Bandwidth  | 5 Hz to 10 MHz (8 MHz with 2-stage amplifier); no DC coupling }}
{{Spec | Rise time  | 40 ns (50 ns with 2-stage amplifier) }}
{{Spec | Deflection | Without amplifier, 27 V per cm maximum, 200 V/cm minimum, DC or peak to peak AC.  1-stage amplifier, 2.7 V/cm maximum, 40 V/cm minimum.  2-stage amplifier, 0.27 V/cm maximum, 4 V/cm minimum.  }}
{{Spec | Input      | 1 MΩ // 40 pF; 600 V max. DC+peak AC }}
{{Spec | Sweep      | 100 ns/cm to 10 ms/cm + variable; ×5 magnifier }}
{{Spec | Trigger    | 0.5 to 50 V (Peak) sine or pulse ≥50 ns }}
{{Spec | X input    | DC coupled via 100 K potentiometer and sweep amplifier; 1.5 V/cm or less; DC to 800 kHz }}
{{Spec | CRT        | [[5CP]], 3 kV acceleration }}
{{Spec | Calibrator | Clipped sine wave of power line frequency, ranges 0-0.3, 0-1, 0-3, 0-10, 0-30, 0-100 V<sub>p-p</sub> }}
{{Spec | Outputs    | Sweep sawtooth, 20 V<sub>p-p</sub>; Positive and negative gate, 40 V<sub>p-p</sub> }}
{{Spec | Weight    | 511 – 29 kg (65 lb); 511A – 23 kg (50 lb); }}
{{Spec | Dimensions | 15½" high, 12½" wide, 21 ½" deep }}
{{Spec | Power      | 511 – 180 W; 511A – 105-125 or 210-250 V, 50-60 Hz, 230 W }}
{{EndSpecs}}
(511A unless noted otherwise)
 
There is also a 511AD, where the "D" in the model number indicates that it has an L-C [[delay line]].
 
==Prices==
* $795 in 1948 (~$9,700 in 2023 dollars)
 
==Internals==
The 511 and 511A were normally furnished with P1 [[phosphor]].  P7 and P11 were optional, at no extra charge.


It uses a standard CRT, the [[5CP1A]]. The vertical output of the 511A is a pair of [[6AG7]] tubes,  
The 511/511A uses a standard CRT, the [[5CP1A]] ([[phosphor|P1]]), [[5CP7A]] ([[phosphor|P7]]) or [[5CP11A]] ([[phosphor|P11]]) below S/N 5100, the [[5AB]]P from 5100 up.
The vertical output of the 511A is a pair of [[6AG7]] tubes,  
AC-coupled to the vertical deflection plates.   
AC-coupled to the vertical deflection plates.   


The 511A does not have response down to DC. The frequency range is specified as 10 Hz to 10 MHz.
Neither the 511 nor the 511A has a [[thermal cutoff]].   
There is also a 511AD. The "D" in the model number indicates that it has a L-C [[delay line]].
The 511AD was available through 1953.
The 511 weighs 65 pounds (29 kg) and consumes 180 W.  The 511A weighs 50 pounds (23 kg) and consumes 230 W.
 
Neither the 511 nor the 511A has a [[thermal cutoff]].  The 511AD was available through 1953.


The 511 was produced with serial numbers 101 to 454.  The 511A has serial numbers 455 and up.
The 511 was produced with serial numbers 101 to 454.  The 511A has serial numbers 455 and up.
The main difference between the 511 and the 511A is the power supply.
The main difference between the 511 and the 511A is the power supply.
In the 511 there are two power transformers,  
In the 511 there are two power transformers, T1 and T2, both operating on 60 Hz mains power with their primaries in parallel.
T1 and T2, both operating on 60 Hz mains power with their primaries in series.
T1 produces the CRT anode and cathode voltages, as well as various other regulated and unregulated voltages.   
T1 produces the CRT anode and cathode voltages, as well as various other
The CRT cathode and anode voltages in the 511 are simply rectified voltages from the secondary of T1.   
regulated and unregulated voltages.  The CRT cathode and anode voltages in
The lack of regulation means that variations in mains voltage results in variation of deflection sensitivity.   
the 511 are simply rectified voltages from the secondary of T1.  The lack
 
of regulation means that variations in mains voltage results in variation
In the 511A, the CRT cathode and anode voltages are produced by a 2 kHz oscillator that is powered by the 511A's +225 V<sub>DC</sub> regulated supply.   
of deflection sensitivity.   
This results in vertical deflection calibration that is independent of mains voltage.
In the 511A, the CRT cathode and anode voltages are produced by an 2 kHz oscillator  
that is powered by the 511A's +225 V<sub>DC</sub> regulated supply.  This results in vertical
deflection calibration that is independent of mains voltage.


The 511 and 511A use a [[6AL5]] tube (V3) as the disconnect diode for the sweep.
The 511 and 511A use a [[6AL5]] tube (V3) as the disconnect diode for the sweep.


Tektronix engineer Frank Hood recollects:
There was an option that added a 1 μs marker generator.
 
===Delay===
The Tektronix Type 1-AD-25 delay was available as a factory option for the 511.
With the delay, the scope is a 511-AD.
The delay is composed of 24 L-C sections.
Even when ordered without the delay, the 511's chassis was pre-drilled for the delay so that it could be added later, in the field, without drilling.
The delay could be switched in and out of the signal path, presumably to avoid the slight signal degradation the delay causes.
 
==History==
* See also https://vintagetek.org/tektronix-first-products/
 
Tektronix engineer [[Frank Hood]] recollects:
<blockquote>My first assignment was to build or modify some special instruments for Bonneville Power. They wanted a device that would detect and record any lightning strikes or arc-overs on the high voltage power lines running between Vancouver, Wash. and other cities such as Longview, Spokane, etc. They wanted to detect each event, in a fraction of a millionth of a second, then to send a pulse of energy down the defective line and measure the time it took to return, (this was an application much like radar). They wanted markers displayed at each mile and fraction of a mile so that they could determine the exact location of the fault. They needed to record a photographic image for latter study. Two or more such instruments were built. We called these Type 511B. They worked very well and were used for several years.
<blockquote>My first assignment was to build or modify some special instruments for Bonneville Power. They wanted a device that would detect and record any lightning strikes or arc-overs on the high voltage power lines running between Vancouver, Wash. and other cities such as Longview, Spokane, etc. They wanted to detect each event, in a fraction of a millionth of a second, then to send a pulse of energy down the defective line and measure the time it took to return, (this was an application much like radar). They wanted markers displayed at each mile and fraction of a mile so that they could determine the exact location of the fault. They needed to record a photographic image for latter study. Two or more such instruments were built. We called these Type 511B. They worked very well and were used for several years.
</blockquote>
[[John Addis]] says:
<blockquote>
The 511 was indeed somewhat crude. The vaunted calibrator which Vollum introduced to give people the sense that you could make real measurements is actually just a 60 Hz sine wave off the power transformer, not even a square wave, so it is completely unregulated. Fortunately for Vollum, both the calibrator and the CRT HV are unregulated. When the line voltage goes down, the scope sensitivity goes up (reduced HV makes beam converge less after plates). So the displayed calibrator amplitude is not very sensitive to line voltage.
</blockquote>
</blockquote>


The 511 and 511A were normally furnished with P1 [[phosphor]].  P7 and P11 were optional, at no extra charge.
==Links==
* [http://richardsears.wordpress.com/2012/01/07/near-the-beginning-of-an-era-the-tektronix-511a/ Detailed article on 511A]
* ''[Note 1]'' TekWeek March 23, 1984 says $595 but the advertised price was $795 (see below).


There was an option that added a 1 μs marker generator.
==Pictures==
===511===
<gallery>
Tek 511 1.jpg|511
Tek 511 2.jpg|511
Tek 511 3.jpg|511
Tek 511 4.jpg|511
Vollum scope - Electronics Magazine April 1948.jpg | Vollum scope - Electronics Magazine, April 1948
Septad511.jpg|511 ad from September 1948
</gallery>


==Specifications==
===511A===
<gallery>
Tek 511a 1.JPG|511A
Tek 511a 2.JPG|511A
Tek 511a 3.JPG|511A
Tek 511a 4.JPG|511A
Tek 511a 5.JPG|511A
Tek 511 ps.png
511a-ps.png|511A
511a-vertical.png|511A
511a sweep.png|511A
511A ad from Electronics 1948-11 p239.jpg | 511A ad from Electronics Magazine, November 1948, p.239
</gallery>


==Pictures==
===511AD===
<gallery>
<gallery>
Image:Tek 511a 1.JPG
Tek 511ad 1.jpg|511AD
Image:Tek 511a 2.JPG
Tek 511ad 2.jpg|511AD
Image:Tek 511a 3.JPG
Tek 511ad 3.jpg|511AD
Image:Tek 511a 4.JPG
Tek 511_ad4.jpg|511AD
Image:Tek 511a 5.JPG
Image:Tek 511 ps.png
Image:511a-ps.png
Image:511a-vertical.png
Image:511a sweep.png
</gallery>
</gallery>


[[Category:500 series scopes]]
{{Parts|511}}
{{Parts|511A}}
 
[[Category:Monolithic tube scopes]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/9607...80015"

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