P80

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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 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)

Pictures

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  Vents for tube

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  P80 attached to Model 80

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  Amphenol 165-14 connector, plugs into Type 80

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  Photo from 1959 catalog showing Type 581 mainframe, Type 80 plug-in, Type P80 probe, and attenuator heads

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  Schematic

Components

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