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Tektronix 3S3
Dual-trace sampling plug-in
3S3 Front View

Compatible with 560-series scopes

Produced from 1963 to (?)

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 3S3 is a sampling plug-in for 560-series scopes.

It requires P6038 probes which contain miniature sampling gates.

The 3S3 is recommended in the Type 111 manual for checking the output pulse risetime.

The 3S3 has a main chassis and sub-chassis that plug into it. There is a sub-chassis extension, part number 012-077, that allows maintenance of the sub-chassis.

Key Specifications

Rise time 350 ps
Bandwidth 1 GHz

please extend


Documents Referencing 3S3


The sampling gates use four GaAs sampling diodes.

The sampling pulse is produced by the Gate Generator module in the plug-in using a blocking oscillator driving a 152-115 step recovery diode and a 6.5 cm clipping line. Balanced pulses are sent up the cable to the sampling gate. The output of the sampling gate returns to the plug-in through the same cable, and enters the preamp. The same blocking oscillator that generates the sampling pulses also generates the strobe for the memory circuit. The sampling efficiency is specified to be 2%.



Some Parts Used in the 3S3

Part Part Number(s) Class Description Used in
152-115 152-115 152-0115-00 Discrete component step recovery diode 3S3 3S76
7308 154-0371-00 Vacuum Tube (Dual Triode) dual triode 3S76 3S3 4S1 4S2A 4S3 S-311
8056 154-0417-00 Vacuum Tube (Triode) low-voltage Nuvistor triode 422 502 W 1S1 3A7 3S3 3T4 5T3 10A1