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* [[Media:tek_511_manual.pdf|Tektronix 511 Manual (PDF, OCR, bad-OCR)]] | * [[Media:tek_511_manual.pdf|Tektronix 511 Manual (PDF, OCR, bad-OCR)]] | ||
}} | }} | ||
The 511 was '''Tek's second product''', | The 511 was '''Tek's second product''', [[introduced in 1947|introduced in June 1947]]. (The first was the [[101|Type 101 Video Calibrator]].) | ||
[[introduced in 1947|introduced in June 1947]]. | A revised version, the 511A, was [[introduced in 1950]]. [[Howard Vollum]] was directly involved with the design of the 511. | ||
(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== | ||
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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. | ||
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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 | ||
Vollum scope - Electronics Magazine April 1948.jpg | Vollum scope - Electronics Magazine, April 1948 | |||
Septad511.jpg|511 Ad from September 1948 | Septad511.jpg|511 Ad from September 1948 | ||
Tek 511ad 1.jpg|511AD | Tek 511ad 1.jpg|511AD |