3A1S

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The Tektronix 3A1S is a vertical plug-in for the 561S. It is specified to have an input impedance of 47pF in parallel with 1 megohm. Input sensitivity in a 561S is from 10mV/div to 10V/div. Risetime is specified to be 14ns, giving a -3dB frequency of 25MHz. The input signal passes through a compensated attenuator switch and then into a 7586 cathode-follower biased with 2mA plate current.

  • 3A1S input amplifier and switching

    3A1S input amplifier and switching

  • 3A1S output amplifier

    3A1S output amplifier

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