3A74: Difference between revisions

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image=tek-3a74-front.jpg |  
image=tek-3a74-front.jpg |  
caption=3A74 front|
caption=3A74 front|
introduced=1963 |
introduced=1962 |
discontinued=(?) |
discontinued=(?) |
series=[[560-series scopes]]|
series=[[560-series scopes]]|

Revision as of 10:36, 21 August 2014

Template:Plugin Sidebar 2 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.

Specifications

Key Specifications

Bandwidth 2 MHz
Input impedance 1 MΩ // 47 pF
Deflection 20 mV/Div to 10 V/Div in 1–2–5 sequence
Features
  • Invert switch per channel

Links

Pictures