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The Type N was introduced in 1960, followed by the [[661]] a year later, and discontinued in 1964, | The Type N was introduced in 1960, followed by the [[661]] a year later, and discontinued in 1964, | ||
making it the shortest-lived plug-in. | making it the shortest-lived plug-in. | ||
The sampling circuit of the Type N is primitive. It uses a single diode, | |||
the "interrogate diode", D5480. The strobe pulse is added to the input | |||
signal using a passive summing circuit. Consequently, the amplitude of | |||
the kick-out pulse from the input is high, about 150mV. | |||
For calibration of the timebase of the Type N, the [[013-028|013-028 Timing Standard]] was produced. | For calibration of the timebase of the Type N, the [[013-028|013-028 Timing Standard]] was produced. | ||