105

The Tektronix 105 is a 25 Hz to 1 MHz square-wave generator. It was designed by Howard Vollum and Charles Sanford and has an all-tube construction.

Manuals – Specifications – Links – Pictures

The 105 has a d'Arsonval meter on its front panel indicating the current frequency. The frequency meter works on the principle of moving a constant amount of charge per cycle, integrating this charge into a current, and measuring the current.

The output is generated at the plates of three 6AG7 triodes that run in parallel.

Key Specifications

Frequency	25 Hz to 1 MHz
Rise and fall time	20 ns (10% to 90%)
Amplitude	10 V to 100 Vp-p (internal 600 Ω load); 1.5 V to 15 Vp-p (external 93 Ω load)
Power	250 W
Weight	35 pounds

Pictures

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  105 front

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  Early style of 105 with blocky meter

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  manual

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  powered on

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  internal view, tube side

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  right interior

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  output section detail

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  output waveform of 105

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  Block diagram

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  Power supply schematic

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  Generator schematic

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  Early Tek 105 with horizontal case

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  Early Tek 105 with power light below switches

Components