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{{Oscilloscope Sidebar |manufacturer=Tektronix |designers=Frank Hood |
{{Oscilloscope Sidebar
series= |
|manufacturer=Tektronix
model= 511|
|series=
summary=10 MHz Tube scope<br />''First Tektronix oscilloscope''|
|model=511
image=Tek 511 1.jpg|
|summary=10 MHz Tube scope<br />''First Tektronix oscilloscope''
caption=Tektronix 511 front |
|image=Tek 511 1.jpg
introduced=1947 |
|caption=Tektronix 511 front
discontinued=1953 |
|introduced=1947
manuals=
|discontinued=1953
* [http://w140.com/tek_511.pdf Tektronix 511 Manual (PDF)]
|designers=Frank Hood;Logan Belleville;Howard Vollum
* [http://bama.edebris.com/download/tek/511aearly/Tek%20511A%20Pre%20SN2869.pdf Tektronix 511A Manual pre SN 2869 (PDF)]
|manuals=
* [http://bama.edebris.com/download/tek/511alater/Tek%20511A%20SN%202869-5099.pdf Tektronix 511A Manual SN 2869-5099 (PDF)]
* [[Media:IM-511.pdf|Tektronix 511/511A Manual]] (PDF, OCR, includes S/N 5100+ information)
* [http://richardsears.wordpress.com/2012/01/07/near-the-beginning-of-an-era-the-tektronix-511a/ Richard Sears' 511A Page]
* [[Media:IM-511A-1.pdf|Tektronix 511A Manual Pre SN 2869]] (PDF, OCR)
* [http://w140.com/1947+Tektronix_Catalog.pdf Tektronix 1947 Catalog with 511 (PDF)]
* [[Media:IM-511A-2.pdf|Tektronix 511A Manual SN 2869-5099]] (PDF, OCR)
 
* [https://richardsears.wordpress.com/2012/01/07/near-the-beginning-of-an-era-the-tektronix-511a/ Richard Sears' 511A Page]
* [[Media:tek_511_manual.pdf|Tektronix 511 Manual (PDF, OCR, bad-OCR)]]
* [https://w140.com/1947+Tektronix_Catalog.pdf Tektronix 1947 Catalog with 511] (PDF)
}}
}}
The 511 was '''Tek's second product''',  
The 511 was '''Tek's first oscilloscope''', [[introduced in 1947|introduced in June 1947]], but the second product (the first was the [[101|Type 101 Video Calibrator]]). [[Howard Vollum]] was directly involved with the design of the 511. A revised version, the 511A, was [[introduced in 1948|introduced in November 1948]].
[[introduced in 1947|introduced in June 1947]].
(The first was the [[101|Type 101 Video Calibrator]].)
A revised version, the 511A, was [[introduced in 1950]].  
[[Howard Vollum]] was directly involved with the design of the 511.


==Specifications==
==Specifications==
The 511A does not have response down to DC.
The 511A does not have response down to DC − frequency range is specified as 10 Hz to 10 MHz.  
The frequency range is specified as 10 Hz to 10 MHz.  
There is also a 511AD, where the "D" in the model number indicates that it has a L-C [[delay line]].
There is also a 511AD.
The "D" in the model number indicates that it has a L-C [[delay line]].
The 511 weighs 65 pounds (29 kg) and consumes 180 W.   
The 511 weighs 65 pounds (29 kg) and consumes 180 W.   
The 511A weighs 50 pounds (23 kg) and consumes 230 W.
The 511A weighs 50 pounds (23 kg) and consumes 230 W.
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==Internals==
==Internals==
The 511 uses a standard CRT, the [[5CP1A]].  
The 511 and 511A were normally furnished with P1 [[phosphor]].  P7 and P11 were optional, at no extra charge.
 
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,  
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.   
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The 511AD was available through 1953.
The 511AD was available through 1953.


The 511 was produced with serial numbers 101 to 454.   
The 511 was produced with serial numbers 101 to 454.  The 511A has serial numbers 455 and up.
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 parallel.
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
of deflection sensitivity.   


In the 511A, the CRT cathode and anode voltages are produced by a 2 kHz oscillator  
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.   
that is powered by the 511A's +225 V<sub>DC</sub> regulated supply.  This results in vertical
This results in vertical deflection calibration that is independent of mains voltage.
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.
The 511 and 511A were normally furnished with P1 [[phosphor]].  P7 and P11 were optional, at no extra charge.


There was an option that added a 1 μs marker generator.
There was an option that added a 1 μs marker generator.
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With the delay, the scope is a 511-AD.
With the delay, the scope is a 511-AD.
The delay is composed of 24 L-C sections.
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
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.
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.
The delay could be switched in and out of the signal path, presumably to avoid
the slight signal degradation the delay causes.


==History==
==History==
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511a-vertical.png|511A
511a-vertical.png|511A
511a sweep.png|511A
511a sweep.png|511A
Septad511.jpg|511 Ad from September 1948
Vollum scope - Electronics Magazine April 1948.jpg | Vollum scope - Electronics Magazine, April 1948
Septad511.jpg|511 ad from September 1948
511A ad from Electronics 1948-11 p239.jpg | 511A ad from Electronics Magazine, November 1948, p.239
Tek 511ad 1.jpg|511AD
Tek 511ad 1.jpg|511AD
Tek 511ad 2.jpg|511AD
Tek 511ad 2.jpg|511AD
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Tek 511_ad4.jpg|511AD
Tek 511_ad4.jpg|511AD
</gallery>
</gallery>
{{Parts|511}}
{{Parts|511A}}


[[Category:Monolithic tube scopes]]
[[Category:Monolithic tube scopes]]
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