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Tektronix P80
Active probe for 581/585+80
Tektronix P80

Compatible with 80

Produced from 1959 to (?)


Manuals – Specifications – Links – Pictures

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

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

The P80 came with five attenuator heads:

P80 attenuator heads
part number attenuation factor
010-306 2x
010-307 5x
010-308 10x
010-309 20x
010-310 50x

Key Specifications

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

Part Part Number(s) Class Description Used in
6688 154-0215-00 Vacuum Tube (Pentode) miniature high-slope VHF/UHF pentode P80 3T77 3T77A 4S2A 526 TR-4602