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The Tektronix Type 4S3 is a dual-trace vertical [[sampling_oscilloscope|sampling]] plug-in | The Tektronix Type 4S3 is a 1GHz dual-trace vertical [[sampling_oscilloscope|sampling]] plug-in | ||
for the [[661]] oscilloscope. It uses two [[P6038]] sampling probes. | for the [[661]] oscilloscope. It uses two [[P6038]] sampling probes. The probes contain sampling | ||
gates but not amplifiers. The front-end amplifier is therefore in the 4S3, and is composed of | |||
a [[7308]] tube (premium 6DJ8) with its two triodes connected in a common-cathode cascode topology. | |||
* [http://w140.com/tek_4s3.pdf Tektronix 4S3 Manual (PDF)] | * [http://w140.com/tek_4s3.pdf Tektronix 4S3 Manual (PDF)] |