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The Type O is a letter-series plug-in that contains two op-amps. The input and feedback networks of the op-amps can be configured from the front panel using knobs and/or user-supplied components. 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 which op-amp's output will be displayed, or the regular signal input.

Regular signal bandwidth is 25MHz, maximum sensitivity is 50mV/div, op-amp gain-bandwidth product is 15MHz, and open-loop DC gain is 2500.

Type O was introduced in mid-1962 and it was "in at the finish", available right up to the discontinuance of the entire classic plug-in scope line in 1974.