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It was introduced in 1949 or 1950. | It was introduced in 1949 or 1950. | ||
It is the first Tektronix oscilloscope to contain a [[distributed amplifier]]. | It is the first Tektronix oscilloscope to contain a [[distributed amplifier]]. | ||
The next scopes to use distributed amplifiers were | |||
the [[517]] in 1951 and then the [[541]] and [[545]] in 1955. | |||
The input impedance is 1 Megohm in parallel with 40pF. | The input impedance is 1 Megohm in parallel with 40pF. | ||