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517: Difference between revisions
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* Pin 8: +180V, unregulated | * Pin 8: +180V, unregulated | ||
Later 517A units uses the same cable as the [[551]] and [[555]]. | Later 517A units uses the same cable as the [[551]] and [[555]]. | ||
Although they use the same cable, they are completely incompatible. | |||
The voltages are different. The 517's external power supply | |||
provides +750V to the indicator unit. The highest voltage provided by | |||
the 555 and 551 power supplies is +500V. Also, for example, the 517 | |||
has +180 on pin 8 of the 12-pin connector while the 555 and 551 have | |||
-150V on pin 8. | |||
The 517 makes extensive use of the [[distributed amplifier]] concept. | The 517 makes extensive use of the [[distributed amplifier]] concept. | ||