105

The Tektronix 105 is a 25 Hz to 1 MHz square wave generator. It is all tube.

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. It was designed by Howard Vollum and Charles Sanford.

Specifications

• Frequency range: 25 Hz to 1 MHz
• Rise and fall time (10% to 90%): 20 nanoseconds
• Amplitude range (600-ohm internal load only): 10 V to 100 V peak-to-peak
• Amplitude range (93-ohm external load): 1.5 V to 15 V peak-to-peak
• Power consumption: 250 watts
• Weight: 35 pounds

Manuals

• Tektronix 105 Manual (PDF)
• Tektronix 105 Manual (Djvu)
• Tektronix 105 Field Recalibration Procedure (PDF)

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