3T77: Difference between revisions

972 bytes added ,  24 December 2023
no edit summary
No edit summary
No edit summary
(26 intermediate revisions by 3 users not shown)
Line 1: Line 1:
{{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.jpeg
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  
* [http://bama.edebris.com/download/tek/3t77/3t77.djvu  Tektronix 3T77 Manual (sn#4256, DjVu)]
|manuals=
* [[Media:070-333.pdf | Tektronix 3T77 Manual with 3T77A-related Appendix]]
* 3T77A manual 070-0546-00 needed
<small>
'''Modifications'''
* [[Media:050-0419-00.pdf|Replacement of 152-0074-00 Tunnel Diode with 152-0381-00]]
'''Calibration'''
* [[Media:Tek 3t77 cal outline.pdf | Tektronix 3T77 Calibration Outline]] (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]].


It triggers on either the internal trigger
[[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.
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
The '''Tektronix 3T77A''' made its first appearance in the 1966 catalog.
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.


The 3T77 uses [[2N976]] transistors and [[1N3129]] [[tunnel diodes]].   
Both versions trigger on either the internal trigger pick-off from the vertical plug-in or from an external trigger signal input.   
It uses a [[6688]] tube in the staircase generator circuit.
Triggering is faster and more sensitive with an external input.


==Difference of 3T77 and 3T77A==
The 3T77/3T77A can operate in any of four modes: external sweep, manual sweep, normal, or single sweep. 
Time-Postiton instead Delay-Knob, with more range of delaying by slow sweep rate.
In external sweep mode, an external control voltage is applied to a BNC connector on the front panel of the 3T77
Recovery-Time-Knob can be pulling for HF-sync.  
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.


==Specifications==
{{MissingSpecs}}
[[Category:Specifications needed]]''please add''
 
==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==
==Pictures==
====3T77 Photos====
<gallery>
<gallery>
Tek 3t77 front.JPG|3T77 front
Tek 3t77 front.JPG|3T77 Front
3t77 1.jpg|3T77
3t77 1.jpg|3T77
3t77 2.jpg|3T77
3t77 2.jpg|3T77
Line 61: Line 62:
3t77 8.jpg|3T77
3t77 8.jpg|3T77
3t77 9.jpg|3T77
3t77 9.jpg|3T77
3t77a trig.jpg|3T77A Trigger Board
3t77 trigger schem.png|Trigger schematic
3t77 block diagram.png|Block Diagram
3t77 connector and ps schem.png|Connector and Power Supply
3t77 horizontal amp schem.png|Horizontal Amp Schematic
3t77 staircase schem.png|Staircase Schematic
3t77 fast ramp schem.png|Fast Ramp Schematic
Tek 3t77a front.jpg|3T77A
Tek 3t77a left.jpg|3T77A
Tek 3t77a right.jpg|3T77A
Tek 3t77a triggerboard.jpg|3T77A
Tek 3t77a top.jpg|3T77A
Tek 3t77a rear.jpg|3T77A
</gallery>
</gallery>


====3T77 Schematics====
<gallery>
3t77 trigger schem.png | Trigger Schematic
3t77 block diagram.png | Block Diagram
3t77 connector and ps schem.png | Connector and Power Supply
3t77 horizontal amp schem.png | Horizontal Amp Schematic
3t77 staircase schem.png | Staircase Schematic
3t77 fast ramp schem.png | Fast Ramp Schematic
</gallery>
====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>
==Components==
{{Parts|3T77}}
{{Parts|3T77A}}


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