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The 434 is an analog [[CRT storage scope]] with two independent storage areas on the screen.  
{{Oscilloscope Sidebar |
It has a bandwith of 24 MHz and uses a [[tunnel diodes|tunnel diode]] in its trigger circuit.  
title=Tektronix 434 |
summary=24 MHz analog storage scope |
image=434 Tek 4.jpg |
caption=Tek 434 |
introduced=1971 |
discontinued=(?) |
manuals=
* [http://w140.com/tektronix_434_service.pdf Tektronix 434 Manual sn 500,000 and up (complete, PDF)]
* [http://w140.com/434_below_B500000.pdf Tektronix 434 Manual sn below 500,000 (complete, PDF)]
* [http://w140.com/tek_434.pdf Tektronix 434 Manual (incomplete, PDF)]
}}
The '''Tektronix 434''' is an analog [[CRT storage scope]] with two independent storage areas on the screen.  
 
It has a bandwidth of 24 MHz and uses a [[tunnel diodes|tunnel diode]] in its trigger circuit.  
The storage is done in the CRT itself, by trapping charge on a special fine grid  
The storage is done in the CRT itself, by trapping charge on a special fine grid  
of isolated pads behind the [[phosphor]] where the electron beam is then blocked or released.  
of isolated pads behind the [[phosphor]] where the electron beam is then blocked or released.  


There is a chopped two channel system and the fastest sweep time is 20ns/div.  
There is a chopped two channel system and the fastest sweep time is 20 ns/div.  
An option for a tube with higher sensitivity at high writing speeds was available (OPT. 01).
An option for a tube with higher sensitivity at high writing speeds was available (OPT. 01).


The signal passes through rotary cam-operated input attenuators, then passes through an input amplifier
The signal passes through rotary cam-operated input attenuators, then passes through an input amplifier
that is on a separate small board.  The input amplifier contains a JFET source-follower buffer
that is on a separate small board.  The input amplifier contains a JFET source-follower buffer
that uses a [[2N5911|2N5911A]] (Tektronix part number 151-1032-00) biased with a drain current of 12.5mA
that uses a [[2N5911|2N5911A]] (Tektronix part number 151-1032-00) biased with a drain current of 12.5 mA
and Vgs of -0.26V.  The input amplifier has unity gain, high input impedance, and an output impedance of
and Vgs of -0.26 V.  The input amplifier has unity gain, high input impedance, and an output impedance of
about 120 ohms.  The input amplifier drives a Tek-made differential amplifier chip, part number [[155-0050-01]].
about 120 Ω.  The input amplifier drives a Tek-made differential amplifier chip, part number [[155-0050-01]].


* [http://w140.com/tektronix_434_service.pdf Tektronix 434 Manual sn 500,000 and up (complete, PDF)]
==Specifications==
* [http://w140.com/434_below_B500000.pdf Tektronix 434 Manual sn below 500,000 (complete, PDF)]
[[Category:Specifications needed]]
* [http://w140.com/tek_434.pdf Tektronix 434 Manual (incomplete, PDF)]
''please add''


[[Image:Tek_434.jpg|200px|thumb|left|Tek_434 analog storage scope]]
==Pictures==


<gallery>
<gallery>
Image:Tek 434.jpg
Image:Tek 434 a.jpg
Image:Tek 434 a.jpg
Image:434 Tek 2.jpg
Image:434 Tek 2.jpg
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[[Category:400 series scopes]]
[[Category:400 series scopes]]
[[Category:Specifications needed]]
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