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* [http://w140.com/tek_s4.pdf Tektronix S-4 Manual, copyright 1969 (PDF)] | * [http://w140.com/tek_s4.pdf Tektronix S-4 Manual, copyright 1969 (PDF)] | ||
* [http://w140.com/tek_S4_1985.pdf Tektronix S-4 Manual, revised 1985 (PDF)] | * [http://w140.com/tek_S4_1985.pdf Tektronix S-4 Manual, revised 1985 (PDF)] | ||
* [http://w140.com/frye_s4_gate.pdf George Frye's Explanation of S-4 sampler in October 1968 Service Scope (PDF)] | |||
<gallery> | <gallery> | ||
Image:Tek s4.jpg | Image:Tek s4.jpg |