517: Difference between revisions

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The '''Tektronix 517''' is a 50 MHz scope [[introduced in 1950]] or [[introduced in 1951|1951]].
The '''Tektronix 517''' is a 50 MHz scope [[introduced in 1950]] or [[introduced in 1951|1951]].
The power supply is an external box, like the [[507]], [[551]] and [[555]]. [[Category:Introduced in 1950]]
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 (1955-1965).
The 517 does not take plug-ins.
There is also a 517A (1955-1965).


==Specifications==
==Specifications==
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.   


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The 517 uses 24 kV total acceleration voltage on the CRT.   
The 517 uses 24 kV total acceleration voltage on the CRT.   
This is generated by the [[420|Type 420]] High Voltage Power Supply subsystem in the 517.   
This is generated by the [[420|Type 420]] High Voltage Power Supply subsystem in the 517.   
It uses a 1.8 kHz oscillator to produce the high voltage, unlike other Tek scopes which use HV oscillators in the ultrasonic range.
It uses a 1.8 kHz oscillator to produce the high voltage,
unlike 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 24 kV acceleration voltage,  
The 517 has a switch on the front panel that selects between normal vertical sensitivity,
which uses the full 24 kV acceleration voltage,  
and "X2" mode, which drops the acceleration voltage to 12 kV for a doubling of the vertical sensitivity.   
and "X2" mode, which drops the acceleration voltage to 12 kV for a doubling of the vertical sensitivity.   
The control works by switching the voltage division ratio of the feedback to the error amplifier in the HV supply.
The control works by switching the voltage division ratio of the feedback to the error amplifier in the HV supply.
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== Comparison of 517 with 547 ==
== Comparison of 517 with 547 ==
In 1965, following the introduction of the 50 MHz [[547]], the
In 1965, following the introduction of the 50 MHz [[547]], the 517 was discontinued.
517 was discontinued. The 547 uses a non-distributed solid-state vertical
The 547 uses a non-distributed solid-state vertical amplifier,
amplifier, [[tunnel diodes|tunnel diode]] triggering, and a 6.5 V/cm CRT,  
[[tunnel diodes|tunnel diode]] triggering, and a 6.5 V/cm CRT,  
thereby achieving good performance with
thereby achieving good performance with
lower cost, size, weight, complexity, and power consumption than the 517.
lower cost, size, weight, complexity, and power consumption than the 517.
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==Pictures of 517A ==
==Pictures of 517A ==
<gallery>
<gallery>
Image:517A_1.JPG |517A Front
517A_1.JPG |517A Front
Image:517A_2.JPG |517A Power Supply
517A_2.JPG |517A Power Supply
Image:6_57.JPG |517A with cart
6_57.JPG |517A with cart
</gallery>
</gallery>
[[Category:Monolithic tube scopes]]
[[Category:Monolithic tube scopes]]
[[Category:Introduced in 1950]]

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