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The Tektronix Type 221 is a miniature 5MHz analog scope [[introduced in 1973]].
{{Oscilloscope Sidebar |
title=Tektronix 221 |
summary=5 MHz miniature analog scope |
image=Tek 221 1.jpg |
caption=Tektronix 221 |
years=1973 – ? |
manuals=
* [http://w140.com/mmm/tek-221.pdf Tektronix 221 Manual (PDF)]
}}
The Tektronix Type 221 is a miniature 5 MHz analog scope [[introduced in 1973]].
 
It has a switching power supply and built-in rechargeable batteries (which are
It has a switching power supply and built-in rechargeable batteries (which are
a maintenance issue).  It has a transformer-coupled trigger circuit which  
a maintenance issue).  It has a transformer-coupled trigger circuit which  
would seem to preclude DC level-based triggering.  The trigger circuit uses a  
would seem to preclude DC level-based triggering.  The trigger circuit uses a  
[[1N3713]] 1mA [[tunnel_diodes|tunnel diode]].  The vertical output amplifier that drives the
[[1N3713]] 1mA [[tunnel_diodes|tunnel diode]].  The vertical output amplifier  
CRT plates is two opamps made from discrete transistors.  One drives the top deflection
that drives the CRT plates is two opamps made from discrete transistors.  One  
plate and the other drives the bottom plate.
drives the top deflection plate and the other drives the bottom plate.


* [http://w140.com/mmm/tek-221.pdf Tektronix 221 Manual (PDF)]
==Specifications==
 
==Pictures==


<gallery>
<gallery>
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Image:221-2.jpg|221 on top of 565
Image:221-2.jpg|221 on top of 565
</gallery>
</gallery>
[[Category:200 series scopes]]
[[Category:Specifications needed]]

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