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511: Difference between revisions
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* [[Media:IM-511A-1.pdf|Tektronix 511A Manual SN <2869]] (OCR) | * [[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) | * [[Media:IM-511A-2.pdf|Tektronix 511A Manual revised in 1951 for SN 2869-5099]] (OCR) | ||
* [[Media:1947_Tektronix_Catalog.pdf|Tektronix 1947 "Catalog" (511 only)]] | * [[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]]. | 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]]. | ||
[[Howard Vollum]] was directly involved with the design of the 511. | |||
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.'' | 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 | An improved version, the 511A, was [[introduced in 1948|introduced in November 1948]]. Major improvements included a regulated power supply for CRT, and a (in later models, s.b.) a calibrator. The 511AD was available through 1953. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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==Internals== | ==Internals== | ||
The 511 | The 511/511A uses a standard CRT, the [[5CP1A]] (with P1 [[phosphor]]), [[5CP7A]] ([[phosphor|P7]]) or [[5CP11A]] ([[phosphor|P11]]) below S/N 5100, the [[5AB]]P from 5100 up. P1 was standard, P7 and P11 optional at no extra charge. | ||
The vertical output is a pair of [[6AG7]] tubes, AC-coupled to the vertical deflection plates. The horizontal amplifier is DC-coupled through a chain of five [[NE-2]] neons on either side for voltage offset. | |||
There was an option that added a 1 μs marker generator. | |||
Neither the 511 nor the 511A has a [[thermal cutoff]]. | Neither the 511 nor the 511A has a [[thermal cutoff]]. | ||
===511A differences=== | |||
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, T1 and T2, both operating on 60 Hz mains power with their primaries in parallel. | |||
In the '''511''', there are two power transformers, 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 regulated and unregulated voltages. | ||
The CRT cathode and anode voltages in the 511 are simply rectified voltages from the secondary of T1. | The CRT cathode and anode voltages in 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. | 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 that is powered by the 511A's +225 V<sub>DC</sub> regulated supply. | 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. | ||
This results in vertical deflection calibration that is independent of mains voltage. | This results in vertical deflection calibration that is independent of mains voltage. | ||
From SN 2406 upward, a dedicated calibrator stage uses one half of a [[12AT7]], V16.1, to clip a voltage derived from the mains transformer to a 100 V level divided from the regulated +225 V rail. | From SN 2406 upward, a dedicated calibrator stage uses one half of a [[12AT7]], V16.1, to clip a voltage derived from the mains transformer to a 100 V level divided from the regulated +225 V rail. | ||
===Delay=== | ===Delay=== | ||
The Tektronix Type 1-AD-25 delay was available as a factory option for the | The Tektronix Type 1-AD-25 delay line, composed of 24 L-C sections, was available as a factory option for the 511A. With the delay, the scope is a 511-AD. | ||
With the delay, the scope is a 511-AD | |||
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. | 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. | The delay could be switched in and out of the signal path, presumably to avoid the slight signal degradation the delay causes. | ||
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==Links== | ==Links== | ||
* [ | * [https://richardsears.wordpress.com/2012/01/07/near-the-beginning-of-an-era-the-tektronix-511a/ Richard Sears' detailed 511A Page] | ||
* ''[Note 1]'' TekWeek March 23, 1984 says $595 but the advertised price was $795 (see below). | * ''[Note 1]'' TekWeek March 23, 1984 says $595 but the advertised price was $795 (see below). | ||