81: Difference between revisions

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The Type 81 contains a two-stage amplifier.  The letter-series plug-in drives
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]])
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.   
so that the plug-in sees conditions similar to the [[500_Series_plug-in_interface|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.
The second stage is a [[6DJ8]] cathode-follower, which drives the [[580_Series_plug-in_interface|580-series scope's 93 Ω input impedance]].


Type 81A has a FET source follower pair followed by cascoded BJT amplifiers.
Type 81A has a FET source follower pair followed by cascoded BJT amplifiers.

Revision as of 13:13, 12 May 2020

Template:Plugin Sidebar 2 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 81 and 81A are significantly different. Type 81 is tube-based and has a bandwidth of 33 MHz. Type 81A is solid-state and has a bandwidth of 50 MHz.

Specifications

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.

Type 81A has a FET source follower pair followed by cascoded BJT amplifiers.

Pictures

Type 81

Type 81A