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The Tektronix 517 is a 50MHz scope [[introduced in 1950]] or [[introduced in 1951|1951]]. The power supply is an external box, like the [[507]], [[551]] and [[555]]. | The Tektronix 517 is a 50MHz scope [[introduced in 1950]] or [[introduced in 1951|1951]]. The power supply is an external box, like the [[507]], [[551]] and [[555]]. | ||
The 517 does not take plug-ins. There is also a 517A. | The 517 does not take plug-ins. There is also a 517A. | ||
== Historic Context == | |||
The 517 closely resembles a scope that Tektronix developed under a contract | The 517 closely resembles a scope that Tektronix developed under a contract | ||
for the US military during 1949 and 1950. (See link below.) | for the US military during 1949 and 1950. (See link below.) | ||
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</blockquote> | </blockquote> | ||
== External Power Supply == | |||
The external power supply and oscilloscope are connected by a removable cable | The external power supply and oscilloscope are connected by a removable cable | ||
with a Jones plug on one end and a Jones socket on the other end. | with a Jones plug on one end and a Jones socket on the other end. | ||
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-150V on pin 8. | -150V on pin 8. | ||
== Distributed Amplifiers == | |||
The 517 makes extensive use of the [[distributed amplifier]] concept. | The 517 makes extensive use of the [[distributed amplifier]] concept. | ||
Originally the [[5XP]] CRT was used, | Originally the [[5XP]] CRT was used, | ||
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* Gain Stage 4: single-ended, common-cathode, [[6AG7]] pentode | * Gain Stage 4: single-ended, common-cathode, [[6AG7]] pentode | ||
== High Voltage Power Supply == | |||
The 517 uses 24kV total acceleration voltage on the CRT. This is generated by the Type 420 High Voltage | The 517 uses 24kV total acceleration voltage on the CRT. This is generated by the Type 420 High Voltage | ||
Power Supply subsystem in the 517. It uses a 1.8kHz oscillator to produce the high voltage, unlike | Power Supply subsystem in the 517. It uses a 1.8kHz oscillator to produce the high voltage, unlike | ||
other Tek scopes which use HV oscillators in the ultrasonic range. | other Tek scopes which use HV oscillators in the ultrasonic range. | ||
The 517 has a switch on the front panel that selects between normal vertical sensitivity, | |||
which uses the full 24kV acceleration voltage, and "X2" mode, which drops the acceleration | |||
voltage to 12kV for a doubling of the vertical sensitivity. The control works by | |||
switching the the voltage division ratio of the feedback to the error amplifier in the HV supply. | |||
The power consumption of a 517 is 1250 watts. The indicator unit weighs 76 pounds and the external | The power consumption of a 517 is 1250 watts. The indicator unit weighs 76 pounds and the external | ||
power supply weighs 72 pounds. | power supply weighs 72 pounds. | ||
== CRTs Used in the 517 == | |||
517 units with serial numbers 101 through 925 use the DuMont 5XP CRT. | 517 units with serial numbers 101 through 925 use the DuMont 5XP CRT. | ||
Later units use a Tek-made CRT, the T517PxH/T54PxH, where "x" designates | Later units use a Tek-made CRT, the T517PxH/T54PxH, where "x" designates | ||
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6.6kV, 13.3kV, and 20kV. The Tek-made CRT has just one anode connection, 20kV, | 6.6kV, 13.3kV, and 20kV. The Tek-made CRT has just one anode connection, 20kV, | ||
and has 15 V/cm sensitivity at 24kV total acceleration voltage. | and has 15 V/cm sensitivity at 24kV total acceleration voltage. | ||
The 517 might be the only Tektronix instrument to have a part made of wood. | The 517 might be the only Tektronix instrument to have a part made of wood. | ||
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the probe power. | the probe power. | ||
== Comparison of 517 with 547 == | |||
In 1965, following the introduction of the 50MHz [[547]], the | In 1965, following the introduction of the 50MHz [[547]], the | ||
517 was discontinued. The 547 uses a non-distributed solid-state vertical | 517 was discontinued. The 547 uses a non-distributed solid-state vertical | ||