P170CF

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. It requires a 170 Ω termination which is built into the 517 and needs to be externally connected for other instruments (the B170-R terminator with UHF connectors was available for this).

Key Specifications

Attenuation	Without attenuator: ×2 With PAX-1 head: ×4 to ×40 With PAX-2 head: ×20 to ×200 With PAX-3 head: ×200 to ×2000
Input impedance	With attenuators: 12 MΩ // 5 pF @ min att. − 1.2 pF @ max. att.

Links

• The P170CF is discussed in the Tektronix Type 128 manual (PDF)

Pictures

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Some Parts Used in the P170CF

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