535

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.

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

• 

  vertical amplifier