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The Tektronix 123 is a miniature preamplifier [[introduced in 1955]]. | The '''Tektronix 123''' is a miniature preamplifier [[introduced in 1955]]. | ||
The gain is 100, input impedance is 10 | The gain is 100, input impedance is 10 MΩ, and output impedance is | ||
31 | 31 kΩ. Frequency response is from 3 Hz to 25 kHz. | ||
The 123 uses two [[CK512AX]] pentodes for amplification and is powered by | The 123 uses two [[CK512AX]] pentodes for amplification and is powered by | ||
batteries. | batteries. | ||
| Line 8: | Line 9: | ||
the plate of one of the tubes, without an output coupling (DC block) | 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. | capacitor. So the output signal rides on about 15 volts of DC. | ||
The intended use of the 123 is as a preamplifier for other | The intended use of the 123 is as a preamplifier for other | ||
instrumentation such as an oscilloscope, and the oscilloscope's | instrumentation such as an oscilloscope, and the oscilloscope's | ||
| Line 22: | Line 24: | ||
File:Tek 123 internal.jpg|internal view | File:Tek 123 internal.jpg|internal view | ||
</gallery> | </gallery> | ||
[[Category:Amplifiers]] | |||
[[Category:Introduced in 1955]] | |||