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The Tektronix Type 3B4 is a timebase plug-in for [[560-series scopes]].  It was introduced in 1964.
{{Plugin Sidebar
It was intended primarily for use
| manufacturer=Tektronix
with the 561A, but works fine in other 560-series scopes. The 3B4 is unusual in having an explicit
| series=560-series scopes
"FREE RUN" mode. 
| type=3B4
In the triggered modes, the [[tunnel diodes|tunnel diode]]-based triggering is rated to work to 20MHz. 
| summary=Timebase plug-in
The vertical bandwidth of typical 560-series (non-sampling) scopes is about 10MHz, so 20MHz is adequate.
| designers=
Triggering is done with a [[TD3A]] 4.7mA tunnel diode.  The trigger input is amplified and buffered by a
| image=3b4_front.jpg
[[6DJ8]]-based differential amplifier driving a common-emitter [[2N964]] germanium PNP transistor whose
| caption=3B4 Front View
collector current switches the tunnel diode.
| introduced=1964
| discontinued=(?)
| manuals=
* [[Media:070-431.pdf|Tektronix 3B4 Manual]] (OCR)
* [[Media:Tek 3b4 fcp jan 1969.pdf‎|Tektronix 3B4 Factory Calibration Procedure, January 1969]]
* [[Media:Tek 3b4 fcp june 1967.pdf|Tektronix 3B4 Factory Calibration Procedure, June 1967]]
}}
The '''Tektronix Type 3B4''' is a timebase plug-in for [[560-series scopes]], introduced in 1964.


* [http://bama.edebris.com/download/tek/3b4/3b4.djvu Tektronix 3B4 Manual (DjVu)]
It was intended primarily for use with the [[561A]], but works fine in other 560-series scopes.
* [http://w140.com/3b4.pdf Tektronix 3B4 Manual (PDF)]
The 3B4 is unusual in having an explicit "FREE RUN" mode. 
 
In the triggered modes, the [[tunnel diodes|tunnel diode]]-based triggering is rated to work to 20 MHz.
The vertical bandwidth of typical 560-series (non-sampling) scopes is about 10 MHz, so 20 MHz is adequate. 
 
{{MissingSpecs}}
 
==Links==
* [http://www.barrytech.com/tektronix/vintage/tek3b4.html Tek 3B4 @ barrytech.com]
{{Documents|Link=3B4}}
 
==Internals==
Triggering is done with a [[TD3A]]/1N3717 4.7 mA tunnel diode.
The trigger input is amplified and buffered by a [[6DJ8]]-based differential amplifier driving a common-emitter
[[2N964]] germanium PNP transistor whose collector current switches the tunnel diode.
 
==Pictures==


<gallery>
<gallery>
Image:3b4_front.jpg|front view
3b4_front.jpg| Front View
Image:3b4_left.jpg|left side view
3b4_left.jpg | Left Side View
Image:3b4_right.jpg|right side view
3b4_right.jpg| Right Side View
Image:3b4_top.jpg|top view
3b4_top.jpg | Top View
</gallery>
</gallery>
==Components==
{{Parts|3B4}}
[[Category:560 series plugins]]

Latest revision as of 16:59, 7 December 2023

Tektronix 3B4
Timebase plug-in
3B4 Front View

Compatible with 560-series scopes

Produced from 1964 to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 3B4 is a timebase plug-in for 560-series scopes, introduced in 1964.

It was intended primarily for use with the 561A, but works fine in other 560-series scopes. The 3B4 is unusual in having an explicit "FREE RUN" mode.

In the triggered modes, the tunnel diode-based triggering is rated to work to 20 MHz. The vertical bandwidth of typical 560-series (non-sampling) scopes is about 10 MHz, so 20 MHz is adequate.

Key Specifications

  • please add

Links

Documents Referencing 3B4

(no results)

Internals

Triggering is done with a TD3A/1N3717 4.7 mA tunnel diode. The trigger input is amplified and buffered by a 6DJ8-based differential amplifier driving a common-emitter 2N964 germanium PNP transistor whose collector current switches the tunnel diode.

Pictures

Components

Some Parts Used in the 3B4

Part Part Number(s) Class Description Used in
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
6BL8 154-0278-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 67 2B67 3B1 3B1S 3B2 3B3 3B4 503 504 506 516 549 561 561A 561S 564 565 567 Telequipment D52 Telequipment D56 Telequipment S31 Telequipment S32 Telequipment S32A Telequipment S51 Telequipment S52
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 111 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O W Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
7119 154-0340-00 Vacuum Tube (Dual Triode) dual triode 067-506 067-0532-00 191 3A3 3B4 3B5 516 545B 549 661 Chemtrix 205
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