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The Tektronix Type 81 is a plug-in adapter so that letter-series and 1-series plug-ins can
The Tektronix Type 81 is a plug-in adapter so that letter-series and 1-series plug-ins can
be used in 580-series scopes.   
be used in 580-series scopes.  The Type 81 contains a two-stage amplifier.  The letter-series
plug-in drives the input stage of the Type 81 which is a high impedance, similar to the input
of a 530-, 540-, or 550-series scope.  The second stage of the Type 81 is a cathode-follower,
which drives the 580-series scope using a low impedance, as is required by 580-series scopes.


<gallery>
<gallery>
Image:Type-81-schem.png
Image:Type-81-schem.png
</gallery>
</gallery>

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