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HP 3440a

A digital Nixie voltmeter from the late 1960s. Inflation-adjusted price ~$25,000.
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  • Front panel view.

    Front panel view.

  • Backplane connector for modules.

    Backplane connector for modules.

  • Top-down view of internals (Nixie cards in the middle).

    Top-down view of internals (Nixie cards in the middle).

  • One of several modules--those aren't ordinary copper traces!

    One of several modules--those aren't ordinary copper traces!

  • High-voltage supply board (note red socket in upper left)

    High-voltage supply board (note red socket in upper left)

  • A power supply board.

    A power supply board.

  • Nixie card.

    Nixie card.

  • Close-up side view of tube.

    Close-up side view of tube.

  • Front of tube.

    Front of tube.

  • Another view (genuine Nixie!)

    Another view (genuine Nixie!)

  • Nixie driver embedded in ceramic.

    Nixie driver embedded in ceramic.

  • DC module.

    DC module.

  • Side view.

    Side view.

  • Top-down view.

    Top-down view.

  • Note modular construction.

    Note modular construction.

  • Note wire looms.

    Note wire looms.

  • Bottom (note retention mechanism)

    Bottom (note retention mechanism)

  • Back of module with large Centronics-style connector

    Back of module with large Centronics-style connector

  • Underside of unit.

    Underside of unit.

  • Back of unit.

    Back of unit.

  • Fully operational!

    Fully operational!

  • Side of unit with spring-loaded handles.

    Side of unit with spring-loaded handles.

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    DC module.
    Side view.
    Top-down view.