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+{{Instrument Sidebar
+|manufacturer=Tektronix
+|model=123
+|class=Amplifier
+|series=
+|summary=miniature preamplifier
+|image=Tek 123 front.jpg
+|caption=Tek 123 front
+|introduced=1955
+|discontinued=(?)
+|designers=
+|manuals=
+* [[Media:Tek 123 instruction sheet.pdf|Tektronix 123 Instruction Sheet]]
+}}
 The '''Tektronix 123''' is a miniature preamplifier [[introduced in 1955]].
-The gain is 100, input impedance is 10 MΩ, and output impedance is
-kΩ. Frequency response is from 3 Hz to 25 kHz.
-The 123 uses two [[CK512AX]] pentodes for amplification and is powered by
+It is intended to be used as an audio-frequency AC preamplifier for other instruments such as oscilloscopes.
-batteries.
-Although the 123 is an AC amplifier, the output is taken directly from
+{{BeginSpecs}}
-the plate of one of the tubes, without an output coupling (DC block)
+{{Spec | Bandwidth       | 3 Hz to 25 kHz }}
-capacitor.  So the output signal rides on about 15 volts of DC.
+{{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}}
-The intended use of the 123 is as a preamplifier for other
+==Prices==
-instrumentation such as an oscilloscope, and the oscilloscope's
+* 50$ in 1960 (~$500 in 2023 dollars)
-input coupling can simply be set to "AC".
-[[List of manuals that are needed|Manual needed]].
+==Internals==
+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.
+==Pictures==
 <gallery>
-Image:Tek 123 1958 cat.jpg|Description in 1958 Catalog
+Tek 123 1958 cat.jpg|Description in 1958 Catalog
-Image:Tek 123 front.png|Front panel
+Tek 123 front.png|Front panel
-Image:Tek 123 schematic.png|Schematic
+Tek 123 schematic.png|Schematic
-Image:Tek 123 partslist.png|Parts list
+Tek 123 partslist.png|Parts list
-File:Tek 123 front.jpg|External view
+Tek_123-2.jpg | Left side panel – circuit diagram
-File:Tek 123 internal.jpg|internal view
+Tek_123-3.jpg | Right side panel – parts list
+Tek_123-4.jpg
+Tek_123-5.jpg
+Tek_123-1.jpg
+Tek 123 front.jpg|External view
+Tek 123 internal.jpg|internal view
 </gallery>
+==Components==
+{{Parts|123}}
 [[Category:Amplifiers]]
 [[Category:Introduced in 1955]]