422: Difference between revisions

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The '''Tektronix Type 422''' is a 15 MHz portable dual-trace oscilloscope introduced in 1966.   
The '''Tektronix Type 422''' is a 15 MHz portable dual-trace oscilloscope introduced in 1966.   
It was available withan optional battery back for operation without mains power.   
It was available with an optional battery back for operation without mains power.   


==Specifications==
==Specifications==
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==Internals==
==Internals==
Early versions use an [[8056]] Nuvistor tube for the front-end cathode follower.  Later versions use a FET front
Early versions use an [[8056]] Nuvistor tube for the front-end cathode follower.   
end.  The 8056 Nuvistor used in the input amplifier of the 422 can be replaced by a [[MPF102]] JFET.
Later versions use a FET front end.   
The 8056 Nuvistor used in the input amplifier of the 422 can be replaced by a [[MPF102]] JFET.


The trigger circuit in the 422 has a trigger amplifier driving a [[1N3719]] [[tunnel diode]], D375, which
The trigger circuit in the 422 has a trigger amplifier driving a [[1N3719]] [[tunnel diode]], D375, which

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