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{{Oscilloscope Sidebar | | {{Oscilloscope Sidebar | ||
|manufacturer=Tektronix | |||
summary=10 MHz Tube scope<br />''First Tektronix oscilloscope''| | |series= | ||
image=Tek 511 1.jpg| | |model=511 | ||
caption=Tektronix 511 front | | |summary=10 MHz Tube scope<br />''First Tektronix oscilloscope'' | ||
introduced=1947 | | |image=Tek 511 1.jpg | ||
discontinued=1953 | | |caption=Tektronix 511 front | ||
manuals= | |introduced=1947 | ||
* [ | |discontinued=1953 | ||
* [ | |designers=Frank Hood;Logan Belleville;Howard Vollum | ||
* [ | |manuals= | ||
* [ | * [[Media:IM-511.pdf|Tektronix 511/511A Manual]] (PDF, OCR, includes S/N 5100+ information) | ||
* [ | * [[Media:IM-511A-1.pdf|Tektronix 511A Manual Pre SN 2869]] (PDF, OCR) | ||
* [[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] | |||
* [https://w140.com/1947+Tektronix_Catalog.pdf Tektronix 1947 Catalog with 511] (PDF) | |||
}} | }} | ||
The 511 was '''Tek's | 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]] | |||
( | |||
[[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. | ||
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 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. | ||
| Line 30: | Line 26: | ||
==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. | ||
| Line 37: | Line 35: | ||
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 | 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. | ||
There was an option that added a 1 μs marker generator. | There was an option that added a 1 μs marker generator. | ||
| Line 62: | Line 53: | ||
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== | ||
Tektronix engineer [[Frank Hood]] recollects: | Tektronix engineer [[Frank Hood]] recollects: | ||
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511a-vertical.png|511A | 511a-vertical.png|511A | ||
511a sweep.png|511A | 511a sweep.png|511A | ||
Septad511.jpg|511 | 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 | ||
| Line 99: | Line 91: | ||
Tek 511_ad4.jpg|511AD | Tek 511_ad4.jpg|511AD | ||
</gallery> | </gallery> | ||
{{Parts|511}} | |||
{{Parts|511A}} | |||
[[Category:Monolithic tube scopes]] | [[Category:Monolithic tube scopes]] | ||