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 </small>
 }}
-The '''Tektronix Type O''' is a [[letter-series and 1-series plug-ins|letter-series plug-in]] that contains two op-amps.
+The '''Tektronix Type O''' is a [[letter-series and 1-series plug-ins|letter-series plug-in]], designed by [[Hiro Moriyasu]], that contains two op-amps and a vertical amplifier.
-It was designed by [[Hiro Moriyasu]].
 It was [[introduced in 1962|introduced in mid-1962]] and was available through 1973.
@@ Line 37: / Line 37: @@
 There are sockets on the front panel for banana plugs.
-Type O also has a regular signal input that does not involve the op-amps.
+A mode switch selects the display to be taken from either op-amp's output, or the vertical amplifier input.
-A mode switch selects which op-amp's output will be displayed, or the regular signal input.
-==Specifications==
+{{BeginSpecs}}
-Regular signal bandwidth is 25 MHz, maximum sensitivity is 50 mV/div, op-amp gain-bandwidth product is 15 MHz, and open-loop DC gain is 2500.
+{{Spec | Bandwidth    | DC to 25 MHz (Vertical amplifier<sup>1</sup>) }}
+{{Spec | Rise time    | 14 ns (Vertical amplifier <sup>1</sup>) }}
+{{Spec | Deflection   | 50 mV/div to 10 V/div, 1–2–5, and variable (Vertical amplifier) }}
+{{Spec | Input        | 1 MΩ // 47 pF (Vertical amplifier) }}
+{{Spec | Opamp GBW    | 15 MHz }}
+{{Spec | Opamp gain   | 2500 }}
+{{Spec | Opamp output | ±50 V, ±5 mA; output impedance 30 Ω @ 1 MHz }}
+{{Spec | Opamp noise  | typ. 0.5 mV<sub>p-p</sub> referred to the input }}
+{{Spec | Internal Z   | input and feedback can be selected from 10 kΩ, 100 kΩ, 200 kΩ, 500 kΩ, 1 MΩ, or 10 pF to 1 μF in decade steps }}
+{{EndSpecs}}
+''Note 1: In 540- and 580-series scopes and 555''
+<small>
+===Accessories===
+{{2ColBegin}}
+* [[013-0049-01]] Standard Shielded Cover (two supplied with each plugin)
+* [[013-0048-01]] Terminal Adapter Assembly (empty box for user chosen components)
+* [[013-0081-00]] Compensating Adapter
+* [[013-0068-00]] Gating Adapter
+* [[013-0086-00]] Leakage Current Adapter
+* [[013-0067-00]] Logarithmic Amplifier Adapter
+* [[067-0507-00]] Grid Current Checker (calibration fixture)
+{{2ColEnd}}
+</small>
-==Accessories==
+==Prices==
-:[[013-0049-01]] Standard Shielded Cover (two supplied with each plugin)
+* $625 in 1971 ($4,700 in 2023 dollars)
-:[[013-0048-01]] Terminal Adapter Assembly (empty box for user chosen components)
-:[[013-0081-00]] Compensating Adapter
-:[[013-0068-00]] Gating Adapter
-:[[013-0086-00]] Leakage Current Adapter
-:[[013-0067-00]] Logarithmic Amplifier Adapter
-==Calibration Fixtures==
+==Internals==
-:[[067-0507-00]] Grid Current Checker
+The opamps are implemented using two [[12AU6]] as a differential pair followed by two systems of a [[6DJ8]] as a bootstrapped cathode follower.
-==Prices==
+The vertical amplifier also starts with a 12AU6 differential pair, which is followed by a pair of [[2N1143]] 200 MHz transistors.
-* $625 in 1971 ($4,200 in 2021 dollars)
 ==Pictures==
 <gallery>
-Tek Type O front.jpg | Front view
+Tek Type O front.jpg       | Front view
-Type_o_front.jpg|Front view
+Tek_Type_O_front_Peter.jpg | Front view
-Type_o_top.jpg|Top view
+Type_o_top.jpg             | Top view
-Type_o_right.jpg|Right view
+Type_o_right.jpg           | Right view
-Type_o_left.jpg|Left view
+Type_o_left.jpg            | Left view
 Type-o.jpg
 Tek type o adp1.JPG
 Tek type o adp2.JPG
-Tek type o schem.png|Opamp Schematic
-Tek type o preamp.png|Preamp Schematic
 Tek o fr1.jpg
 Tek o fr2.jpg
@@ Line 79: / Line 91: @@
 </gallery>
+'''Schematics'''
+<gallery>
+Tek type o schem.png|Opamp Schematic
+Tek type o preamp.png|Preamp Schematic
+</gallery>
+==Components==
 {{Parts|O}}
 [[Category:500 series plugins]]