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 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]].
-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.
 The 81 and 81A are significantly different.
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 ==Specifications==
 [[Category:Specifications needed]] ''please add''
+==Internals ==
+The Type 81 contains a two-stage amplifier.  The letter-series plug-in drives
+the input stage of the Type 81 which is high impedance (grids of a [[6GM8]] stage with [[T-coil peaking]])
+so that the plug-in sees conditions similar to the input of a 530-, 540-, or 550-series scope.
+The second stage is a [[6DJ8]] cathode-follower, which drives the 580-series scope's 93 Ω input impedance.
 ==Pictures==