3T77: Difference between revisions

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{{Plugin Sidebar 2|
{{Plugin Sidebar
title=Tektronix 3T77 |
|manufacturer=Tektronix
summary=Sampling sweep plug-in |
|series=560-series scopes
image=Tek 3t77 front.JPG |
|type=3T77  
caption=Tektronix 3T77 front |
|summary=Sampling sweep plug-in  
series=[[560-series scopes]] |
|image=Tek 3t77 front.JPG  
introduced=1962 |
|caption=Tektronix 3T77 front  
discontinued=1973 |
|designers=Bob Webb; Jim Geddes; Cliff Moulton
manuals=
|introduced=1962  
* [http://w140.com/tek_3t77_sn2642.pdf Tektronix 3T77 Manual (sn#2642, PDF)]
|discontinued=1973  
|manuals=
* [[Media:070-333.pdf|Tektronix 3T77 Manual]] (PDF, SN#2642)
* [http://bama.edebris.com/download/tek/3t77/3t77.djvu  Tektronix 3T77 Manual (sn#4256, DjVu)]
* [http://bama.edebris.com/download/tek/3t77/3t77.djvu  Tektronix 3T77 Manual (sn#4256, DjVu)]
* [[Media:050-0419-00.pdf|Modification Note Documenting Replacement of 152-0074-00 Tunnel Diode with 152-0381-00 (PDF)]]
* [[Media:050-0419-00.pdf|Modification Note Documenting Replacement of 152-0074-00 Tunnel Diode with 152-0381-00 (PDF)]]
* [[Media:Tek 3t77 cal outline.pdf|Tektronix 3T77 Calibration Outline (PDF, OCR)]]
* [[Media:Tek 3t77 cal outline.pdf|Tektronix 3T77 Calibration Outline (PDF, OCR)]]
}}
}}
The '''Tektronix 3T77''' is a [[sampling_oscilloscope|sampling]]  
The '''Tektronix 3T77''' is a [[sampling_oscilloscope|sampling]] sweep plug-in for [[560-series scopes]].
sweep plug-in for [[560-series scopes]].
It was [[introduced in 1962]], along with the [[567]] and [[3S76]].
It was [[introduced in 1962]], along with the [[567]]
and [[3S76]].


[[Bob Webb]] and maybe [[Jim Geddes]] and possibly [[Cliff Moulton]] designed the Type 77,  
[[Bob Webb]] and maybe [[Jim Geddes]] and possibly [[Cliff Moulton]] designed the Type 77, later named the 3T77.
later named the 3T77.


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


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


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</gallery>
</gallery>


{{Parts|3T77}}


[[Category:Sampling plugins]]
[[Category:Sampling plugins]]
[[Category:560 series plugins]]
[[Category:560 series plugins]]

Revision as of 15:04, 10 October 2021

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

Compatible with 560-series scopes

Produced from 1962 to 1973

Manuals
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 Type 77, later named the 3T77.

It triggers 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 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 on horizontal trace, and then waits for the button to be pressed again.

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-Postiton instead Delay-Knob, with more range of delaying by slow sweep rate. Recovery-Time-Knob can be pulling for HF-sync.

Specifications

please add

Pictures


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 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 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