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The Tektronix P170CF is a cathode-follower probe intended for use with the 517 scope, or a Type 128 power supply. It came with three attenuator heads.

The P170CF uses a 5718 triode.


Attenuation  ×2 basic, PAX-1 head ×4 to ×40, PAX-2 head ×20 to ×200
Input impedance 12 MΩ // 5 pF with attenuators