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which look like [[letter-series and 1-series plug-ins]] | which look like [[letter-series and 1-series plug-ins]] | ||
but are electrically different, | but are electrically different, | ||
primarily in the impedance of the signal interface between the plug-in and the scope. | primarily in the impedance of the signal interface | ||
The [[81|Type 81]] adapter allows the use of letter-series and 1-series plug-ins in a 585. | between the plug-in and the scope. | ||
The [[81|Type 81]] adapter allows the use of | |||
letter-series and 1-series plug-ins in a 585. | |||
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 | ||
trigger amplifier made of a pair of [[6EW6]] | an "A" trigger circuit that has a differential | ||
made of a pair of miniature dual triode tubes. Starting at serial number 1071, the miniature dual triode Schmitt trigger | trigger amplifier made of a pair of [[6EW6]] miniature pentode, | ||
was replaced by 10mA [[tunnel diodes|tunnel diode]] and a pulse amplifier made with an OC171 germanium PNP | followed by a Schmitt trigger | ||
transistor. The tunnel diode is AC-coupled to the base-emitter junction of the transistor. | 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 | |||
transistor. The tunnel diode is AC-coupled to the | |||
base-emitter junction of the transistor. | |||
Like the [[545]], [[551]], and [[555]], the 585 uses a [[distributed amplifier]] for vertical deflection. | Like the [[545]], [[551]], and [[555]], the 585 uses a | ||
[[distributed amplifier]] for vertical deflection. | |||
Unlike the other 500-series scopes, the 585 uses a CRT, | Unlike the other 500-series scopes, the 585 uses a CRT, | ||
with distributed vertical deflection plates, the [[T581]], | with distributed vertical deflection plates, the [[T581]], | ||
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The total CRT acceleration voltage is 10kV. | The total CRT acceleration voltage is 10kV. | ||
Several improvements were published for the 585 circuitry, including the enhanced trigger | Several improvements were published for the 585 circuitry, | ||
circuit. If all of those changes are applied to a 585, it is essentially a 585A. | including the enhanced trigger circuit. | ||
If all of those changes are applied to a 585, | |||
it is essentially a 585A. | |||
Rackmount version were also made, the RM585 and RM585A. | |||
* [http://bama.edebris.com/download/tek/585/585.pdf Tektronix 585 Manual (PDF)] | * [http://bama.edebris.com/download/tek/585/585.pdf Tektronix 585 Manual (PDF)] |