434: Difference between revisions

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The 434 is a analog storage scope with two independent storage areas on the screen. It has a bandwith of 24 MHz and of course TD in its trigger circuit. The storage is done in the image tube itself, by trapping charge on a special fine grid of isolated pads behind the phosphor where the elektron beam is then blocked or released.  
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|series=400-series scopes
|model=434
|summary=24 MHz analog storage scope
|image=434 Tek 4.jpg
|caption=Tek 434
|introduced=1971
|discontinued=1984
|manuals=
* [[Media:070-1915-00.pdf|Tektronix 434 Instruction Manual SN 500,000+]] (complete, OCR)
* [[Media:070-1131-00.pdf|Tektronix 434 Instruction Manual, SN <500,000]] (complete, OCR)
* ''[[Media:070-1142-00.pdf|Tektronix 434 Operators Manual]] needed''
* [[Media:070-1142-01.pdf|Tektronix 434 Operators Manual (March 1984 Revision)]]
* [[Media:Tek 432 and 434 fcp april 1972.pdf|Tektronix 432 and 434 Factory Calibration Procedure, April 1972]]
}}
The '''Tektronix 434''' is an analog [[CRT storage scope]] with two independent storage areas on the screen.  


There is a chopped two channel system and the fastest sweep time is 20nS/div. A option for a tube with higher sensitivity at high writing speeds was available too.
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
of isolated pads behind the [[phosphor]] where the electron beam is then blocked or released.  


[[Image:Tek_434.jpg|200px|thumb|left|Tek_434 analog storage scope]]
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).
 
{{MissingSpecs}}
 
==Links==
* [[050-0674-00|Handle Replacement Modification Kit]]
{{Documents|Link=434}}
{{PatentLinks|434}}
 
==Prices==
 
{| class="wikitable"
|-
! Year
! 1972
! 1973
! 1976
! 1980
|-
! Catalog Price
|align=right| $2,150
|align=right| $2,150
|align=right| $2,850
|align=right| $3,800
|-
! In 2023 Dollars
|align=right| $15,800
|align=right| $14,900
|align=right| $15,400
|align=right| $14,200
|}
 
==Internals==
 
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 uses a [[2N5911|2N5911A]] (Tektronix part number 151-1032-00) biased with a drain current of 12.5 mA
and V<sub>gs</sub> of –0.26 V.  The input amplifier has unity gain, high input impedance, and an output impedance of
about 120 Ω.  The input amplifier drives a Tek-made differential amplifier chip, part number [[155-0050-01]].
 
The original instrument design utilized an all-discrete switching power supply, making this an incredibly light portable scope.
Unfortunately, this power supply was extremely difficult to troubleshoot when it went belly-up.
At serial number B500000 and later, the design of the supply was simplified to use the same basic circuitry as found in the [[7704A]] using a [[155-0067-02|Tek-manufactured controller chip]].
 
==Repair Issues==
See → [[434/Repairs|Repairs page]].
 
==Pictures==
 
<gallery>
Tek 434.jpg
Tek 434 a.jpg
434 Tek 2.jpg
434_Tek_3.jpg
434 Tek 4.jpg
434 Tek 5.jpg
Tek 434 trace.jpg
Tek 434 side connections.jpg|side connections
Tek 434 front up.jpg
</gallery>
 
==Components==
{{Parts|434}}
 
 
[[Category:400 series scopes]]
[[Category:Analog storage scopes]]

Latest revision as of 05:13, 21 June 2024

Tektronix 434
24 MHz analog storage scope
Tek 434

Produced from 1971 to 1984

Manuals
Manuals – Specifications – Links – Pictures

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 diode in its trigger circuit. 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.

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).

Key Specifications

  • please add

Links

Documents Referencing 434

Document Class Title Authors Year Links
Tekscope 1971 V3 N6 Nov 1971.pdf Article New Products 1971 211 • 434 • 4610
Tekscope 1972 V4 N5 Sep 1972.pdf Article Servicing the 432/434 Oscilloscopes Ken Matheson 1972 432 • 434

Patents that may apply to 434

Page Title Inventors Filing date Grant date Links
Patent US 3562464A Cam actuated switch having movable and fixed contacts on circuit board Howard Vollum • Willem H Verhoef • Tony Sprando 1968-10-07 1971-02-09 Cam switches • 2101 • 2701 • 2703 • 432 • 434 • 465 • 475 • 5A15N • 5A18N • 5A20N • 5A21N • 5A38 • 5A45 • 5B10N • 5B12N • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AF501 • AM502 • AM503 • DC502 • DC503 • DC504 • DC505 • DM501 • DM502 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • PG501 • PG502 • PG505 • PG506 • PG506A • PG508 • TG501 • SC502 • SC503 • SC504

Prices

Year 1972 1973 1976 1980
Catalog Price $2,150 $2,150 $2,850 $3,800
In 2023 Dollars $15,800 $14,900 $15,400 $14,200

Internals

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 uses a 2N5911A (Tektronix part number 151-1032-00) biased with a drain current of 12.5 mA and Vgs of –0.26 V. The input amplifier has unity gain, high input impedance, and an output impedance of about 120 Ω. The input amplifier drives a Tek-made differential amplifier chip, part number 155-0050-01.

The original instrument design utilized an all-discrete switching power supply, making this an incredibly light portable scope. Unfortunately, this power supply was extremely difficult to troubleshoot when it went belly-up. At serial number B500000 and later, the design of the supply was simplified to use the same basic circuitry as found in the 7704A using a Tek-manufactured controller chip.

Repair Issues

See → Repairs page.

Pictures

  • side connections

    side connections

Components

Some Parts Used in the 434

Part Part Number(s) Class Description Used in
151-0261-00 151-0261-00 Discrete component dual PNP transistor AM501 • AM502 • CG5001 • CG551AP • FG501 • FG502 • FG503 • OF150 • OF151 • OF152 • OF235 • OS261 • RM502A • R1140 • R5030 • R5031 • R7912 • 067-0679-00 • 067-0807-00 • 1101 • 1140A • 1141 • 1142 • 1350 • 145 • 1450 • 1480 • 1481 • 1482 • 1485 • 1501 • 1801 • 1900 • 1910 • 1980 • 213 • 26A1 • 26A2 • 2620 • 285 • 3A9 • 3A10 • 3S1 • 3S2 • 3S5 • 3S6 • 432 • 434 • 4501 • 454 • 4601 • 4602 • 4610 • 4612 • 4620 • 4632 • 4634 • 4701 • 475 • 492 • 492A • 492AP • 494 • 494P • 496 • 496P • 5A13N • 5A20N • 5A21N • 5A22N • 5A26 • 5L4N • 502A • 5030 • 5031 • 576 • 690SR • 7A22 • 7A29 • 7B51 • 7B71 • 7J20 • 7L5 • 7S11 • 7S12 • 7912AD
155-0028-00 155-0028-00 • 155-0028-01 • 155-0042-00 • 155-0042-01 • 155-0042-02 • 155-0042-03 Monolithic integrated circuit Miller integrator and delay pickoff 5030 • R5030 • 5031 • R5031 • 1401 • 1401A • 1480 • 1481 • 1482 • 1485 • 26G1 • 26G2 • 26G3 • 314 • 335 • 432 • 434 • 4701 • 5B10N • 5B12N • 5B31 • 5B40 • 5B42 • 5S14N • 7B52 • 7B53A • 7B53N • 7L12 • 7L13 • 7L14 • 7L18 • 7S14 • AN/USM-281C • RG501 • Telequipment D63 • Telequipment DM63
155-0050-01 155-0050-00 • 155-0050-01 Monolithic integrated circuit differential vertical preamplifier 432 • 434
155-0051-00 155-0051-00 Monolithic integrated circuit Z-axis and HV regulator 432 • 434
155-0067-02 155-0067-00 • 155-0067-02 • 155-0067-03 Monolithic integrated circuit SMPS controller 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904 • 7904A • 7934 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • 308 • 434 • 485 • 690 • P7001
1N3717 152-0381-00 • 152-0125-00 Discrete component 4.7 mA, 25 pF tunnel diode 1L40 • 1S1 • 1S2 • 11B1 • 11B2 • 11B2A • 147A • 1470 • 148 • 21A • 22A • 3B4 • 3B5 • 408 • 432 • 434 • 453 • 453A • 454 • 466 • 491 • 5T3 • 544 • RM544 • 546 • RM546 • 547 • RM547 • 556 • RM556 • 7B70 • 7B71 • 7D11
2N5911 151-1032-00 Discrete component dual n-channel JFET 434 • 464
STD704 152-0125-00 Discrete component 4.7 mA tunnel diode 1L40 • 1S1 • 11B1 • 11B2 • 11B2A • 147 • R147 • 147A • R147A • 1470 • 148 • R148 • 148-M • 149 • R149 • 149A • R149A • 21A • 22A • 3B4 • 3B5 • 408 • 432 • 434 • 453 • 453A • 454 • 464 • 465 • 466 • 491 • 5T3 • 544 • RM544 • 546 • RM546 • 547 • RM547 • 556 • RM556 • 7B70 • 7B71 • 7D11
T4340 154-0666-10 • 154-0666-12 CRT storage CRT 434
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