81
The Tektronix Type 81 is a plug-in adapter that allows letter-series and 1-series plug-ins to be used in 580-series scopes.
It was later replaced by the Type 81A that is significantly different – while Type 81 is tube-based and has a bandwidth of 33 MHz, Type 81A is solid-state and has a bandwidth of 50 MHz. The 81 was designed by Bill DeVey.
Key Specifications
- please add
Links
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 81 also terminates the grid line of the distributed vertical amplifier (delay line driver).
The Type 81 does not have a spoiler switch.
Pictures
Type 81
-
-
-
Type 81 Schematic
-
-
-
-
-
-
-
-
-
-
Components
Some Parts Used in the 81