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The Tektronix Type P500CF is a cathode-follower probe. It uses a 5718 triode.

It requires +120 VDC for the plate supply and +6.3 VDC for the heater, which can be provided by an oscilloscope (e.g. 517), amplifier (e.g. 1121) or external probe power supply like the 128.

The P500CF is discussed in the Type 128 manual.



Risetime of a P500CF with a 545A and Type K plug-in:

  • 13 ns with no probe attenuation
  • 17.5 ns with the 10x probe attenuator


  • please add

Some Parts Used in the P500CF

Page Class Description Used in
5718 Vacuum Tube (Triode) subminiature high-frequency triode 321 P500CF P170CF