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The Telequipment Type A plug-in, also known as the 43A, is a 15 MHz vertical plug-in for the S43 | The Telequipment Type A plug-in, also known as the 43A, is a 15 MHz vertical plug-in for the [[Telequipment D43|D43]] and [[Telequipment S43|S43]]. | ||
The Type A is four-stage fully differential DC-coupled all-tube amplifier. | The Type A is four-stage fully differential DC-coupled all-tube amplifier. | ||
The input impedance is 1 MΩ in parallel with 40 pF. | The input impedance is 1 MΩ in parallel with 40 pF. |