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3A74: Difference between revisions
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The Tektronix Type 3A74 is a four-channel vertical plug-in [[introduced in 1963]] for | The Tektronix Type 3A74 is a four-channel vertical plug-in [[introduced in 1963]] for | ||
560-series scopes. The bandpass is DC to 2 MHz. Each input signal passes through | [[560-series scopes]]. The bandpass is DC to 2 MHz. Each input signal passes through | ||
switchable input attenuators and then into a cathode-follower made from a 7586 | switchable input attenuators and then into a cathode-follower made from a [[7586]] | ||
Nuvistor triode. That drives a PNP differential amplifier. The output of this | Nuvistor triode. That drives a PNP differential amplifier. The output of this | ||
differential amplifier, for each of the four channels, passes through a diode-based | differential amplifier, for each of the four channels, passes through a diode-based | ||