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The Tektronix 123 is a miniature preamplifier [[introduced in | The Tektronix 123 is a miniature preamplifier [[introduced in 1955]]. | ||
The gain is 100, input impedance is 10 megohms, and output impedance is | The gain is 100, input impedance is 10 megohms, and output impedance is | ||
31 kilohms. The frequency response is from 3 Hz to 25 kHz. | 31 kilohms. The frequency response is from 3 Hz to 25 kHz. | ||
Revision as of 14:45, 6 June 2013
The Tektronix 123 is a miniature preamplifier introduced in 1955. The gain is 100, input impedance is 10 megohms, and output impedance is 31 kilohms. The frequency response is from 3 Hz to 25 kHz. The 123 uses two CK512AX pentodes for amplification and is powered by batteries.
Although the 123 is an AC amplifier, the output is taken directly from the plate of one of the tubes, without an output coupling (DC block) capacitor. So the output signal rides on about 15 volts of DC. The intended use of the 123 is as a preamplifier for other instrumentation such as an oscilloscope, and the oscilloscope's input coupling can simply be set to "AC".
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Description in 1958 Catalog
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Front panel
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Schematic
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Parts list
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External view
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internal view
