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The Tektronix 514 is a monolithic general-purpose oscilloscope introduced in 1949 or 1950. It was designed by Tektronix engineers Bob Davis and Dick Rhiger. Using a three-section distributed distributed amplifier, it provides frequency response from DC to 10MHz. Prior to the 514, customers had to choose between an instrument with 10MHz bandwidth (the 511) or an instrument with DC response (the 512). The 514 provides DC response and 10MHz bandwidth.

A 514D model exists, which has a lumped L-C delay line. There is also a 514AD. How does the 514AD differ from the 514D?

It has no thermal cutoff.