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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. |