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

Revision as of 16:09, 29 April 2011

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 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 differential amplifier, for each of the four channels, passes through a diode-based analog signal switching network (multiplexer). The output of that multiplexer drives the output amplifier, which is part transistor, part tube. The one-hot select line signals for the multiplexer are generated by a transistor-based ring oscillator, a four-state cyclic state machine. This allows each of the input signals to be traced on the screen, one after another.