581

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Tektronix 581
100 MHz (85 MHz) oscilloscope
Tektronix 581 (early model)

Produced from 1959 to 1972

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The Tektronix 581 is a 100 MHz tube scope similar to the 585, but with simplified trigger and sweep circuitry. Like all 580-series scopes, it uses 580-series plug-ins. It was introduced in 1959.

The vertical signal path of the 581 is the same as that of the 585. It uses the T581 CRT. Type 581 scopes with serial numbers up to 510 use an all-tube trigger circuit.

Starting at serial number 511, the 581 uses tunnel diode triggering.

A Type 581A was introduced later, and it is specified to have a bandwidth of 85 MHz instead of 100 MHz. The somewhat relaxed bandwidth specification improved CRT production yield which had been a problem when the scope was specified to 100 MHz.

The 580 series were the last Tektronix scopes to use distributed amplifiers for vertical deflection.

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