519

The Type 519 is a high-speed oscilloscope made by Tektronix from the late 1950's to the early 1970's. It is very unusual in that it does not contain vertical amplifiers. The input signal is passively connected to the distributed vertical deflection plates of the CRT which driven single-ended. This allows the scope to have 1GHz bandwidth. The vertical deflection factor is 10 v/cm. The input to the 519 has an impedance of 125 ohms. The input connector is a special 125-ohm GR connector that is not electrically or mechanically compatible with the much more common 50-ohm connector.

To allow viewing of the rising edge of pulses, there is a rigid coaxial 45 nanosecond delay line between the input and the CRT.

The horizontal deflection signal of a 519 is generated by a 4CX250F lighthouse RF tube. The sweep is triggered using a 20mA, 4pF tunnel diode.

The 519 contains a calibration step generator that produces voltage steps with 100 picosecond rise time.