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.
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
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In 1963 Catalog
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Block Diagram
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Front
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Top
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Left side
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Right side
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Gate Generator
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Gate Generator
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Bottom
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Rear
