123: Difference between revisions

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Image:Tek 123 schematic.png|Schematic
Image:Tek 123 schematic.png|Schematic
Image:Tek 123 partslist.png|Parts list
Image:Tek 123 partslist.png|Parts list
File:Tek 123 front.jpg|External view
File:Tek 123 internal.jpg|internal view
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Revision as of 16:43, 30 October 2012

The Tektronix 123 is a miniature preamplifier introduced in 1958. 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".

Manual needed.