434

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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

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Links

Documents Referencing 434

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

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

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