3A74: Difference between revisions

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The Tektronix Type 3A74 is a four-channel vertical plug-in [[introduced in 1963]] for
{{Plugin Sidebar|
[[560-series scopes]].  The bandpass is DC to 2 MHz.  Each input signal passes through
title=Tektronix 3A74|
summary=2 MHz four channel vertical amp|
image=Image needed.jpg |
caption=image needed (please add)|
years=1963 – ? |
type=Vertical Amplifier|
series=[[560-series scopes]]|
manuals=
* [http://bama.edebris.com/download/tek/3a74/3a74.djvu Tektronix 3A74 Manual (DjVu)]
}}
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]]
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
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This allows each of the input signals to be traced on the screen, one after another.
This allows each of the input signals to be traced on the screen, one after another.


* [http://bama.edebris.com/download/tek/3a74/3a74.djvu Tektronix 3A74 Manual (DjVu)]
==Specifications==
{{BeginSpecs}}
{{Spec | Bandwidth | 2 MHz}}
{{Spec | Input impedance | 1 MΩ // 47 pF }}
{{Spec | Deflection | 20 mV/Div to 10 V/Div in 1–2–5 sequence }}
{{Spec | Features |
* Invert switch per channel
}}
{{EndSpecs}}
 
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/3A74.htm Tek 3A74 page @ amplifier.cd]
 
==Pictures==
[[Category:Image needed]] ''please add''
 
 
[[Category:560 series plugins]]

Revision as of 10:42, 25 June 2014

{{{manufacturer}}} Vertical Amplifier
2 MHz four channel vertical amp
image needed (please add)

Compatible with [[560-series scopes]]

Produced from {{{introduced}}} to {{{discontinued}}}

Manuals
(All manuals in PDF format unless noted otherwise)
[[Category:Introduced in {{{introduced}}}]]
Manuals – Specifications – Links – Pictures

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

please add