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81: Difference between revisions
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Grid line termination
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so that the plug-in sees conditions similar to the [[500_Series_plug-in_interface|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_plug-in_interface|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 81 also terminates the grid line of the [[Distributed_amplifier | distributed vertical amplifier]] (delay line driver). | |||
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. | ||