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535

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The Type 535 is a 10MHz* oscilloscope that accepts letter-series and 1-series plug-ins. There are two timebases, and triggering is done with a Schmitt trigger made of a 6U8 tube (in early instruments) or a 6DJ8 tube (in late instruments). The 535 is functionally the same as a 545, but with a simpler, non-distributed vertical amplifier. Early 535s came in brown, square-cornered cabinets; in 1956 the cabinet became blue and round-cornered. Early 535s had selenium rectifiers.

Type 535, the single-timebase Type 531, and the first four plugins, Types 53A, 53B, 53C, and 53D], were introduced in August 1954, advertised as '...the "convertibles" of the Tektronix line'. Types 541 and 545 came out in March 1955.

in 1959, Types 531, 535, 541, and 545 were superseded by Types 531A, 535A, 541A, and 545A, which have more convenient controls. In addition, Types 531A and 535A have slightly faster (15MHz vs 11MHz) vertical amplifiers.

* With Types A or B plugin. 11MHz with Type K or other fast plugin.