1,875
edits
81: Difference between revisions
m
no edit summary
No edit summary |
mNo edit summary |
||
| Line 26: | Line 26: | ||
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. | ||