4S3

The Tektronix Type 4S3 is a 1 GHz dual-trace vertical sampling plug-in for the 661 oscilloscope. It uses two P6038 sampling probes.

Tektronix 4S3
1 GHz dual-trace sampling plugin 4S3 Compatible with 661 Produced from 1963 to (?) Manuals Tektronix 4S3 Manual Tektronix 4S3 Calibration Outline (OCR) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The probes contain sampling gates but not amplifiers. The front-end amplifier is in the 4S3 and is composed of a 7308 tube (premium 6DJ8) with its two triodes connected in a common-cathode cascode topology.

Pictures

In 1963 Catalog
Block Diagram
Front
Top
Left side
Right side
Gate Generator
Gate Generator
Bottom
Rear
4S3 with S-52 through 015-1002-00 14 dB SMA attenuator