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 | 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 | ||