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The '''Tektronix 123''' is a miniature preamplifier [[introduced in 1955]]. | The '''Tektronix 123''' is a miniature preamplifier [[introduced in 1955]]. | ||
It is intended to be used as an audio-frequency AC preamplifier for other instruments such as oscilloscopes. | |||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | 3 Hz to 25 kHz }} | |||
{{Spec | Voltage gain | ×100 (40 dB) }} | |||
{{Spec | Noise | ≤7.5 μV<sub>RMS</sub>, input-referred }} | |||
{{Spec | Max. input | 0.1 V<sub>p-p</sub> }} | |||
{{Spec | Input impedance | 10 MΩ }} | |||
{{Spec | Output impedance| 31 kΩ }} | |||
{{Spec | Power | One 1.345 V mercury battery (RM3R) and one miniature 30 V battery (413); 100 hours runtime }} | |||
{{EndSpecs}} | |||
==Prices== | |||
* 50$ in 1960 (~$500 in 2023 dollars) | |||
==Internals== | |||
The 123 uses two [[CK512AX]] pentodes for amplification and is powered by batteries. | 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. | 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. | ||
==Pictures== | ==Pictures== | ||
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Tek 123 schematic.png|Schematic | Tek 123 schematic.png|Schematic | ||
Tek 123 partslist.png|Parts list | Tek 123 partslist.png|Parts list | ||
Tek_123-2.jpg | Tek_123-2.jpg | Left side panel – circuit diagram | ||
Tek_123-3.jpg | Tek_123-3.jpg | Right side panel – parts list | ||
Tek_123-4.jpg | Tek_123-4.jpg | ||
Tek_123-5.jpg | Tek_123-5.jpg | ||
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</gallery> | </gallery> | ||
==Components== | |||
{{Parts|123}} | {{Parts|123}} | ||
[[Category:Amplifiers]] | [[Category:Amplifiers]] | ||
[[Category:Introduced in 1955]] | [[Category:Introduced in 1955]] | ||