581

The Tektronix 581 is similar to the 585, but with simplified trigger and sweep circuitry. 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 cicrcuit. 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 85MHz instead of 100MHz. The somewhat relaxed bandwidth specification improved CRT production yield which had been a problem when the scope was specified to 100MHz.

• Tektronix 581 Manual (PDF)
• Tektronix 581A Manual (PDF)

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  early 581

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  wrinkle and chrome from early 581.

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  TD trigger instead of 6DJ8 trigger.

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  late trigger using tunnel diode