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The Type M is a four-channel letter-series plug-in. Early models had UHF connectors for the inputs. Later models have BNC connectors for the inputs. The risetime is 17 nanoseconds, bandwidth is DC to 20MHz. Each input goes through a step attenuator, is clamped by a neon bulb, and then is fed to the grid of a cathode follower made with a 7586 Nuvistor tube. Next, the signal goes to a PNP differential amplifier. Diodes in series with the collector signal | The Type M is a four-channel letter-series plug-in. Early models had UHF connectors for the inputs. Later models have BNC connectors for the inputs. The risetime is 17 nanoseconds, bandwidth is DC to 20MHz. Each input goes through a step attenuator, is clamped by a neon bulb, and then is fed to the grid of a cathode follower made with a 7586 Nuvistor tube. Next, the signal goes to a PNP differential amplifier. Diodes in series with the collector signal of this differential amplifier are used for input channel switching. | ||
An internal differential signal bus connects the switched outputs of each of the input channels and feeds the signal to the output amplifier, which drives the signal output, pins 1 and 3 of the plug-in connector. The output amplifier is two 12AU6 pentodes connected as a differential amplifier, followed by a 12AT7 dual triode acting as a cathode follower to drive the output with a relatively low impedance. | An internal differential signal bus connects the switched outputs of each of the input channels and feeds the signal to the output amplifier, which drives the signal output, pins 1 and 3 of the plug-in connector. The output amplifier is two 12AU6 pentodes connected as a differential amplifier, followed by a 12AT7 dual triode acting as a cathode follower to drive the output with a relatively low impedance. | ||