P500CF

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

It requires +120 V_DC for the plate supply and +6.3 V_DC 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.

Key Specifications

Rise time	13 ns (17.5 ns with 10x attenuator); P500CF with 545A and Type K plug-in

Pictures

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Components

Some Parts Used in the P500CF

Part	Part Number(s)	Class	Description	Used in
5718	154-0053-00	Vacuum Tube (Triode)	subminiature high-frequency triode	321 • P500CF • P170CF