P500CF

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.

The P500CF is discussed in the Type 128 manual.

Manual

• Tektronix P500CF Manual (PDF)

Specs

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

Pictures

• please add

Some Parts Used in the P500CF

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