517: Difference between revisions

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as follows:
as follows:


* Gain Stage 1: single-ended, six sections, distributed, [[6AK5]] tubes
* Gain Stage 1: single-ended, six sections, distributed, [[6AK5]] pentodes
* Gain Stage 2: single-ended, six sections, distributed, [[6AK5]] tubes
* Gain Stage 2: single-ended, six sections, distributed, [[6AK5]] pentodes
* Gain Stage 3: single-ended, seven sections, distributed, [[6AK5]] tubes
* Gain Stage 3: single-ended, seven sections, distributed, [[6AK5]] pentodes
* Trig Pickoff: one common-cathode [[6CB6]] pentode
* Signal Delay: 51 feet of RG63U 125-ohm coaxial cable
* Signal Delay: 51 feet of RG63U 125-ohm coaxial cable
* Phase Splitter: single-ended in, differential out, three sections, distributed, [[6CB6]] tubes
* Phase Splitter: single-ended in, differential out, three sections, distributed, [[6CB6]] pentode
* Gain Stage 4: differential, six sections, distributed, [[6CB6]] tubes
* Gain Stage 4: differential, six sections, distributed, [[6CB6]] pentodes
* Gain Stage 5: differential, twelve sections, distributed, [[6CB6]] tubes
* Gain Stage 5: differential, twelve sections, distributed, [[6CB6]] pentodes


The 517 uses 24kV of acceleration voltage on the CRT.  This is generated by the Type 420 High Voltage
There is a trigger amplifier in the 517 which can its input from
an external source, or
from the trigger pickoff in the vertical pre-amp, or
from the internal rate generator circuit. 
The trigger amplifier circuit has
five stages:
 
* Phase Splitter: [[6J6]] dual-triode connected as a differential amplifier
* Gain Stage 1: single-ended, three sections, distributed, [[6AK5]] pentodes
* Gain Stage 2: single-ended, three sections, distributed, [[6AK5]] pentodes
* Gain Stage 3: single-ended, common-cathode, [[6AG7]] pentode
* Gain Stage 4: single-ended, common-cathode, [[6AG7]] pentode
 
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.

Revision as of 18:07, 18 June 2011

The Tektronix 517 is a 50MHz scope introduced in 1950 or 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 closely resembles a scope that Tektronix developed under a contract for the US military during 1949 and 1950.

The external power supply and oscilloscope are connected by a removable cable with Jones plugs on both ends. Units with serial numbers 101-1739 use a 12-pin Jones connectors; after that it is a 16-pin Jones connector. The voltages on the 12-pin connector are:

  • Pin 1: +750V, regulated
  • Pin 2: +475V, regulated
  • Pin 3: +350V, unregulated
  • Pin 4: +225V, regulated
  • Pin 5: +150V, regulated
  • Pin 6: Ground
  • Pin 7: -250V, regulated
  • Pin 8: +180V, unregulated

The 517 makes extensive use of the distributed amplifier concept. The vertical signal path is as follows:

  • Gain Stage 1: single-ended, six sections, distributed, 6AK5 pentodes
  • Gain Stage 2: single-ended, six sections, distributed, 6AK5 pentodes
  • Gain Stage 3: single-ended, seven sections, distributed, 6AK5 pentodes
  • Trig Pickoff: one common-cathode 6CB6 pentode
  • Signal Delay: 51 feet of RG63U 125-ohm coaxial cable
  • Phase Splitter: single-ended in, differential out, three sections, distributed, 6CB6 pentode
  • Gain Stage 4: differential, six sections, distributed, 6CB6 pentodes
  • Gain Stage 5: differential, twelve sections, distributed, 6CB6 pentodes

There is a trigger amplifier in the 517 which can its input from an external source, or from the trigger pickoff in the vertical pre-amp, or from the internal rate generator circuit. The trigger amplifier circuit has five stages:

  • Phase Splitter: 6J6 dual-triode connected as a differential amplifier
  • Gain Stage 1: single-ended, three sections, distributed, 6AK5 pentodes
  • Gain Stage 2: single-ended, three sections, distributed, 6AK5 pentodes
  • Gain Stage 3: single-ended, common-cathode, 6AG7 pentode
  • Gain Stage 4: single-ended, common-cathode, 6AG7 pentode

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 other Tek scopes which use HV oscillators in the ultrasonic range.