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585: Difference between revisions
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The original 585 (up to serial number 1070) has an "A" trigger circuit that has a differential | The original 585 (up to serial number 1070) has an "A" trigger circuit that has a differential | ||
trigger amplifier made of a pair of [[6EW6]] nuvistors, followed by a Schmitt trigger | trigger amplifier made of a pair of [[6EW6]] nuvistors, followed by a Schmitt trigger | ||
made of a pair of | made of a pair of miniature dual triode tubes. Starting at serial number 1071, the miniature dual triode Schmitt trigger | ||
was replaced by 10mA [[tunnel diodes|tunnel diode]] and a pulse amplifier made with an OC171 germanium PNP | was replaced by 10mA [[tunnel diodes|tunnel diode]] and a pulse amplifier made with an OC171 germanium PNP | ||
transistor. The tunnel diode is AC-coupled to the base-emitter junction of the transistor. | transistor. The tunnel diode is AC-coupled to the base-emitter junction of the transistor. | ||