3A74: Difference between revisions
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title=Tektronix 3A74| | title=Tektronix 3A74| | ||
summary=2 MHz four channel vertical amp| | summary=2 MHz four channel vertical amp| | ||
image= | image=tek-3a74-front.jpg | | ||
caption= | caption=3A74 front| | ||
years=1963 – ? | | years=1963 – ? | | ||
type=Vertical Amplifier| | type=Vertical Amplifier| | ||
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==Links== | ==Links== | ||
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/3A74.htm Tek 3A74 page @ amplifier.cd] | * [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/3A74.htm Tek 3A74 page @ amplifier.cd] | ||
* http://www.barrytech.com/tektronix/vintage/tek3a74.html | |||
==Pictures== | ==Pictures== |
Revision as of 10:46, 25 June 2014
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 |
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Input impedance | 1 MΩ // 47 pF |
Deflection | 20 mV/Div to 10 V/Div in 1–2–5 sequence |
Features |
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Links
Pictures
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