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The Tektronix 321 is a very compact single-trace,  
{{Oscilloscope Sidebar |
single-timebase portable oscilloscope  
title=Tektronix 321 |
that is almost completely solid state.   
summary=Portable single channel scope |
image=321_front.jpg|321 front view |
caption=Tek 321 front |
years=1964 – ? |
manuals=
*[http://elektrotanya.com/tektronix_321.pdf/download.html Tektronix 321 Manual]
*[http://bama.edebris.com/manuals/tek/321a/ Tektronix 321A manual]
*[http://w140.com/tek_fcp/tek_type_321_factory_cal_proc.pdf Tektronix 321 factory calibration procedure]
*Needed: 321A SN 6000 up
}}
The Tektronix 321 is a very compact single-trace, single-timebase portable oscilloscope that is almost completely solid state.   
It was [[introduced in 1960|introduced on April 8th, 1960]].
It was [[introduced in 1960|introduced on April 8th, 1960]].
The 321 includes several germanium bipolar transistors,  
 
which are a known reliability problem.   
The 321 includes several germanium bipolar transistors, which are a known reliability problem.   
The 321A was [[introduced in 1964]].
 
The 321 and 321A have slightly different circuits.   
The 321A was [[introduced in 1964]]. The 321 and 321A have slightly different circuits.   
Early instances of the 321 (sn pre-720) use a  
Early instances of the 321 (sn pre-720) use a [[5718]] peanut tube as the front-end cathode follower.   
[[5718]] peanut tube as the front-end cathode follower.   
 
Later 321 and 321A use a [[7586]] Nuvistor for that role. Latest 321A (SN6000 up) use a FET [[151-1011-01]].
Later 321 and 321A use a [[7586]] Nuvistor for that role. Latest 321A (SN6000 up) use a FET [[151-1011-01]].
In several circuits, the 321 uses [[OC170]] transistors  
In several circuits, the 321 uses [[OC170]] transistors where the 321A uses [[2N2207]] transistors.   
where the 321A uses [[2N2207]] transistors.   
 
[http://elektrotanya.com/tektronix_321.pdf/download.html Tektronix 321 Manual]


[http://bama.edebris.com/manuals/tek/321a/ Tektronix 321A manual]
==Specifications==


[http://w140.com/tek_fcp/tek_type_321_factory_cal_proc.pdf Tektronix 321 factory calibration procedure]
==Pictures==
Needed 321A SN 6000 up


<gallery>
<gallery>
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Image:321A_FET.JPG|Latest 321A´s frontend.
Image:321A_FET.JPG|Latest 321A´s frontend.
</gallery>
</gallery>
[[Category:Portable scopes]]
[[Category:CRT based solid-state scopes]]
[[Category:Manual needed]]
[[Category:Specifications needed]]
Retrieved from "https://w140.com/tekwiki/wiki/321"