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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 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 scope's 93 Ω input impedance. | ||
Type 81A has a FET source follower pair followed by cascoded BJT amplifiers. | |||
==Pictures== | ==Pictures== | ||