3A3

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Template:Plugin Sidebar 2 The Tektronix 3A3 is a dual trace differential amplifier for 560-series scopes. It was designed by Roy Hayes.

Key Specifications

  • Deflection: 10 V/Div to 0.1 mV/Div
  • Bandwidth: switch-selectable 500 kHz or 5 kHz
  • Input impedance: 1 MΩ // 47 pF

please add more

Internals

Early 3A3s use a 7586 Nuvistor for the front end cathode follower. Serial numbers 4990 and up use a dual JFET.

Pictures

Older version (SN 4990 below , Nuvistor in input stage)

  • Front SN4990 below

    Front SN4990 below

  • Right side

    Right side

  • Left side

    Left side

  • Nuvistor in input stage

    Nuvistor in input stage

Newer version (SN 4990 up, FET in input stage)

  • Front SN4990 up

    Front SN4990 up

  • Right side

    Right side

  • Left side

    Left side

  • Top

    Top

  • Bottom

    Bottom

  • Dual JFET in input stage

    Dual JFET in input stage

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