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The 3T77 is a sampling sweep plug-in for 560-series
{{Plugin Sidebar
scopes.  It triggers on either the internal trigger
|manufacturer=Tektronix
pick-off from the vertical plug-in or from an external
|series=560-series scopes
trigger signal input. Triggering is faster and more
|type=3T77
sensitive with an external input.  The 3T77 can
|summary=Sampling sweep plug-in  
operate in any of four modes: external sweep, manual
|image=Tek 3t77 front.jpeg
sweep, normal, or single sweep.  In external sweep mode,
|caption=Tektronix 3T77 Front
an external control voltage is applied to a BNC
|designers=Bob Webb; Jim Geddes; Cliff Moulton
connector on the front panel of the 3T77.  This
|introduced=1962
voltage determines the X-position of the spot on the
|discontinued=1973
CRT and, correspondingly, the delay from the trigger
|manuals=
event to the sampling point. Manual mode is the same
* [[Media:070-333.pdf | Tektronix 3T77 Manual with 3T77A-related Appendix]]
as external sweep mode, but the control voltage is
* 3T77A manual 070-0546-00 needed
generated internally based on the position of a
<small>
potentiometer on the front panel of the 3T77.  In
'''Modifications'''
normal mode, an internal ramp generator produces
* [[Media:050-0419-00.pdf|Replacement of 152-0074-00 Tunnel Diode with 152-0381-00]]
the control voltage, repeatedly redrawing the trace
'''Calibration'''
on the CRT.  In single sweep mode, the internal ramp
* [[Media:Tek 3t77 cal outline.pdf | Tektronix 3T77 Calibration Outline]] (OCR)
generator is started by a button on the front panel,
}}
makes on horizontal trace, and then waits for the
The '''Tektronix 3T77''' is a [[sampling_oscilloscope | sampling]] sweep plug-in for [[560-series scopes]].
button to be pressed again.
It was [[introduced in 1962]], along with the [[567]] and [[3S76]].


*http://bama.edebris.com/download/tek/3t77/3t77.djvu
[[Bob Webb]] and maybe [[Jim Geddes]] and possibly [[Cliff Moulton]] designed the a plug-in called "Type 77" (not to be confused with the identically named but totally different non-sampling sweep plug-in also called [[77|Type 77]]). The "Type 77" sampling sweep evolved into the 3T77.


The '''Tektronix 3T77A''' made its first appearance in the 1966 catalog.
Both versions trigger on either the internal trigger pick-off from the vertical plug-in or from an external trigger signal input. 
Triggering is faster and more sensitive with an external input. 
The 3T77/3T77A can operate in any of four modes: external sweep, manual sweep, normal, or single sweep. 
In external sweep mode, an external control voltage is applied to a BNC connector on the front panel of the 3T77. 
This voltage determines the X-position of the spot on the CRT and, correspondingly, the delay from the trigger event to the sampling point. 
Manual mode is the same as external sweep mode, but the control voltage is generated internally based on the position of a potentiometer on the front panel of the 3T77. 
In normal mode, an internal ramp generator produces the control voltage, repeatedly redrawing the trace on the CRT. 
In single sweep mode, the internal ramp generator is started by a button on the front panel, makes one horizontal trace, and then waits for the button to be pressed again.
{{MissingSpecs}}
==Links==
{{Documents|Link=3T77}}
{{PatentLinks|3T77}}
==Internals==
While still tube-based, the 3T77 uses [[2N976]] transistors and [[1N3129]] [[tunnel diodes]]. 
It uses a [[6688]] tube in the staircase generator circuit, and an RCA [[7586]] nuvistor as a ramp-current generator.
The 3T77 mixes "classic" chassis/[[ceramic strip]] construction with the trigger circuit built on a PCB.
===Difference of 3T77 and 3T77A===
TIME POSITION knob instead of a DELAY knob, with more range of delay by slow sweep rate.
The RECOVERY TIME knob can be pulled for HF-sync.
==Pictures==
====3T77 Photos====
<gallery>
Tek 3t77 front.JPG|3T77 Front
3t77 1.jpg|3T77
3t77 2.jpg|3T77
3t77 3.jpg|3T77
3t77 4.jpg|3T77
3t77 5.jpg|3T77
3t77 6.jpg|3T77
3t77 7.jpg|3T77
3t77 8.jpg|3T77
3t77 9.jpg|3T77
</gallery>
====3T77 Schematics====
<gallery>
<gallery>
Image:3t77 1.jpg
3t77 trigger schem.png | Trigger Schematic
Image:3t77 2.jpg
3t77 block diagram.png | Block Diagram
Image:3t77 3.jpg
3t77 connector and ps schem.png | Connector and Power Supply
Image:3t77 4.jpg
3t77 horizontal amp schem.png | Horizontal Amp Schematic
Image:3t77 5.jpg
3t77 staircase schem.png | Staircase Schematic
Image:3t77 6.jpg
3t77 fast ramp schem.png | Fast Ramp Schematic
Image:3t77 7.jpg
</gallery>
Image:3t77 8.jpg
Image:3t77 9.jpg
Image:3t77 trigger schem.png|Trigger schematic
Image:3t77 block diagram.png|Block Diagram
Image:3t77 connector and ps schem.png|Connector and Power Supply
Image:3t77 horizontal amp schem.png|Horizontal Amp Schematic
Image:3t77 staircase schem.png|Staircase Schematic
Image:3t77 fast ramp schem.png|Fast Ramp Schematic


====3T77A Photos====
<gallery>
Tek 3t77a front.jpeg | 3T77A Front
Tek 3t77a left.jpg | 3T77A Left
Tek 3t77a right.jpg | 3T77A Right
3t77a trig.jpg | 3T77A Trigger Board
Tek 3t77a triggerboard.jpg | 3T77A Trigger Board
Tek 3t77a top.jpg | 3T77A Top
Tek 3t77a rear.jpg | 3T77A Rear
</gallery>
</gallery>
==Components==
{{Parts|3T77}}
{{Parts|3T77A}}
[[Category:Sampling plugins]]
[[Category:560 series plugins]]

Latest revision as of 11:02, 19 June 2024

Tektronix 3T77
Sampling sweep plug-in
Tektronix 3T77 Front

Compatible with 560-series scopes

Produced from 1962 to 1973

Manuals

Modifications

Calibration

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 3T77 is a sampling sweep plug-in for 560-series scopes. It was introduced in 1962, along with the 567 and 3S76.

Bob Webb and maybe Jim Geddes and possibly Cliff Moulton designed the a plug-in called "Type 77" (not to be confused with the identically named but totally different non-sampling sweep plug-in also called Type 77). The "Type 77" sampling sweep evolved into the 3T77.

The Tektronix 3T77A made its first appearance in the 1966 catalog.

Both versions trigger on either the internal trigger pick-off from the vertical plug-in or from an external trigger signal input. Triggering is faster and more sensitive with an external input.

The 3T77/3T77A can operate in any of four modes: external sweep, manual sweep, normal, or single sweep. In external sweep mode, an external control voltage is applied to a BNC connector on the front panel of the 3T77. This voltage determines the X-position of the spot on the CRT and, correspondingly, the delay from the trigger event to the sampling point. Manual mode is the same as external sweep mode, but the control voltage is generated internally based on the position of a potentiometer on the front panel of the 3T77. In normal mode, an internal ramp generator produces the control voltage, repeatedly redrawing the trace on the CRT. In single sweep mode, the internal ramp generator is started by a button on the front panel, makes one horizontal trace, and then waits for the button to be pressed again.

Key Specifications

  • please add

Links

Documents Referencing 3T77

(no results)

Internals

While still tube-based, the 3T77 uses 2N976 transistors and 1N3129 tunnel diodes. It uses a 6688 tube in the staircase generator circuit, and an RCA 7586 nuvistor as a ramp-current generator. The 3T77 mixes "classic" chassis/ceramic strip construction with the trigger circuit built on a PCB.

Difference of 3T77 and 3T77A

TIME POSITION knob instead of a DELAY knob, with more range of delay by slow sweep rate.

The RECOVERY TIME knob can be pulled for HF-sync.

Pictures

3T77 Photos

  • 3T77 Front

    3T77 Front

  • 3T77

    3T77

  • 3T77

    3T77

  • 3T77

    3T77

  • 3T77

    3T77

  • 3T77

    3T77

  • 3T77

    3T77

  • 3T77

    3T77

  • 3T77

    3T77

  • 3T77

    3T77

3T77 Schematics

  • Trigger Schematic

    Trigger Schematic

  • Block Diagram

    Block Diagram

  • Connector and Power Supply

    Connector and Power Supply

  • Horizontal Amp Schematic

    Horizontal Amp Schematic

  • Staircase Schematic

    Staircase Schematic

  • Fast Ramp Schematic

    Fast Ramp Schematic

3T77A Photos

  • 3T77A Front

    3T77A Front

  • 3T77A Left

    3T77A Left

  • 3T77A Right

    3T77A Right

  • 3T77A Trigger Board

    3T77A Trigger Board

  • 3T77A Trigger Board

    3T77A Trigger Board

  • 3T77A Top

    3T77A Top

  • 3T77A Rear

    3T77A Rear

Components

Some Parts Used in the 3T77

Part Part Number(s) Class Description Used in
1N3128 152-0074-00 • 152-074 Discrete component 5 mA, 15 pF germanium tunnel diode 3T77 • 5T1
1N3129 152-0043-00 Discrete component 20 mA Germanium tunnel diode 3T77 • 5T1
6688 154-0215-00 Vacuum Tube (Pentode) miniature high-slope VHF/UHF pentode P80 • 3T77 • 3T77A • 4S2A • 526 • TR-4602
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
6EW6 154-0212-00 Vacuum Tube (Pentode) pentode 106 • 132 • 360 • 51 • 527 • 581 • 581A • 585 • 585A • 3T77 • 3T77A
7586 154-0306-00 Vacuum Tube (Triode) Nuvistor triode M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311
RT5204 151-0058-00 Discrete component Silicon NPN transistor 565 • RM565 • Z • 2A61 • 3B1 • 3B3 • 3S76 • 3T77


Some Parts Used in the 3T77A

Part Part Number(s) Class Description Used in
6688 154-0215-00 Vacuum Tube (Pentode) miniature high-slope VHF/UHF pentode P80 • 3T77 • 3T77A • 4S2A • 526 • TR-4602
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
6EW6 154-0212-00 Vacuum Tube (Pentode) pentode 106 • 132 • 360 • 51 • 527 • 581 • 581A • 585 • 585A • 3T77 • 3T77A
7586 154-0306-00 Vacuum Tube (Triode) Nuvistor triode M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311
SMTD914 152-0387-00 Discrete component 20 mA, 4.5 pF tunnel diode S-51 • 3T77A • 040-0390-00
TD254 152-0380-00 Discrete component 22 mA, 18 pF germanium tunnel diode 3T77A
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