O
The Tektronix Type O is a letter-series plug-in, designed by Hiro Moriyasu, that contains two operational amplifiers and a vertical amplifier. It was introduced in mid-1962 and was available through 1973.
The input and feedback networks of the operational amplifiers can be configured from the front panel switches and/or by way of user-supplied components plugged into the front panel banana jacks. Tektronix made several pre-configured plug-in modules to plug directly into those jacks. See the Accessories section below. Note that one of the accessories is an empty box with mating banana plugs for a user-designed circuit.
A mode switch selects the display to be taken from either op-amp's output, or the vertical amplifier input.
Key Specifications
| Bandwidth | DC to 25 MHz (Vertical amplifier1) |
|---|---|
| Rise time | 14 ns (Vertical amplifier 1) |
| Deflection | 50 mV/div to 10 V/div, 1–2–5, and variable (Vertical amplifier) |
| Input | 1 MΩ // 47 pF (Vertical amplifier) |
| Op-Amp GBW | 15 MHz |
| Op-Amp gain | 2500 |
| Op-Amp output | ±50 V, ±5 mA; output impedance 30 Ω @ 1 MHz |
| Op-Amp noise | typ. 0.5 mVp-p referred to the input |
| 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 |
Note 1: In 540- and 580-series scopes and 555 Accessories
- 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)
Links
Prices
| Year | Catalog price | In 2026 dollars |
|---|---|---|
| 1971 | $625 | ~$5,000 |
Internals
The opamps are implemented using two 12AU6 as a differential pair followed by two systems of a 6DJ8 as a bootstrapped cathode follower.
The vertical amplifier also starts with a 12AU6 differential pair, which is followed by a pair of 2N1143 200 MHz transistors.
Pictures
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Front view
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Front view
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Top view
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Right view
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Left view
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pre-production Type O
Schematics
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Opamp Schematic
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Preamp Schematic
