4S1: Difference between revisions

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4 bytes removed ,  20 August 2021
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|designers=
|designers=
|manuals=
|manuals=
* [[Media:070-329.pdf|Late Issue Tektronix 4S1 Manual]] (PDF)
* [[Media:070-329.pdf|Tektronix 4S1 Manual (late)]] (PDF)
* [http://w140.com/tek_661_4s1_5t1_preliminary.pdf Tek 661 4S1 5T1 Preliminary Manual (PDF)]
* [http://w140.com/tek_661_4s1_5t1_preliminary.pdf Tek 661 4S1 5T1 Preliminary Manual (PDF)]
* [[Media:Tek 4s1 cal outline.pdf|Tektronix 4S1 Calibration Outline (PDF, OCR)]]
* [[Media:Tek 4s1 cal outline.pdf|Tektronix 4S1 Calibration Outline (PDF, OCR)]]
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From serial number 101 to 1349, the low frequency path starts with a 25 kΩ resistor that DC-couples the input signal to a [[2N1429]] PNP emitter-follower stage.   
From serial number 101 to 1349, the low frequency path starts with a 25 kΩ resistor that DC-couples the input signal to a [[2N1429]] PNP emitter-follower stage.   
After that is a [[151-103]] NPN common-emitter.  The high frequency path starts with a trigger pick-off  
After that is a [[151-103]] NPN common-emitter.  The high frequency path starts with a trigger pick-off transformer on the input.   
transformer on the input.  The pick-off signal feeds a common-base amplifier that uses a [[2N700]] PNP transistor.
The pick-off signal feeds a common-base amplifier that uses a [[2N700]] PNP transistor.
The low frequency and high frequency trigger paths meet at the trigger output of the 4S1.   
The low frequency and high frequency trigger paths meet at the trigger output of the 4S1.   
From there, the trigger signal passes through the 661, and into a [[5T1]] or [[5T3]].   
From there, the trigger signal passes through the 661, and into a [[5T1]] or [[5T3]].   

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