585
The Type 585 is a 100MHz 580-Series scope introduced by Tektronix in 1959 and made through the 1960's. The 585 uses 580-series plug-ins, which look like letter-series and 1-series plug-ins but are electrically different, primarily in the impedance of the signal interface between the plug-in and the scope. The Type 81 adapter allows the use of letter-series and 1-series plug-ins in a 585. The original 585 has a tube trigger circuit which was replaced by tunnel diode triggering in the 585A. Both use a distributed amplifier for vertical deflection. Unlike other 500-series scopes, the 585 CRT has distributed vertical deflection plates, enabling it to have both high sensitivity and fast risetime. Several improvements were published for the 585 circuitry, including the enhanced trigger circuit. If all of those changes are applied to a 585, it is essentially a 585A.
A rackmount version was also made.
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Front view.
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585A trigger circuit.
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White plastic clip holds tunnel diode for triggering.
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Inside view shows regulator tubes.
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Distributed vertical amplifier.
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RM-585A
