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The Tektronix P80 is an active probe that works only with the Type 80 plug-in for the 581 and 585 oscilloscopes.

The P80 and contains a 6688 (E180F) miniature RF pentode, which functions as a phase splitter providing 93 Ω differential outputs, not a simple cathode-follower.


Rise time 3.5 ns in combination with Type 80
Bandwidth DC to 100 MHz (from 25 Ω source) in combination with Type 80
Deflection 0.1 V/Div (fixed) without optional attenuators; 0.2/0.4/0.5/1/2/5/10/20/50/100/200/500/1000 V/Div with attenuators
Input impedance 100 kΩ // <14 pF (including capacitive coupler, without attenuators)
Input voltage max. 150 VDC in AC position; max. 600 VDC with optional capacitive coupler; max. 100 VDC when DC coupled (without optional attenuators)



Some Parts used in the P80

Page Class Description Used in
6688 Vacuum Tube (Pentode) miniature high-slope VHF/UHF pentode P80 3T77 TR-4602