3T77: Difference between revisions

← Older edit

3T77 (view source)

Revision as of 17:40, 24 December 2023

2,362 bytes added , 24 December 2023

no edit summary

Kurt

Bureaucrats, Interface administrators, Suppressors, Administrators

31,932

edits

@@ Line 1: / Line 1: @@
-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}}
+==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>
-Image:3t77 1.jpg
+Tek 3t77 front.JPG|3T77 Front
-Image:3t77 2.jpg
+t77 1.jpg|3T77
-Image:3t77 3.jpg
+t77 2.jpg|3T77
-Image:3t77 4.jpg
+t77 3.jpg|3T77
-Image:3t77 5.jpg
+t77 4.jpg|3T77
-Image:3t77 6.jpg
+t77 5.jpg|3T77
-Image:3t77 7.jpg
+t77 6.jpg|3T77
-Image:3t77 8.jpg
+t77 7.jpg|3T77
-Image:3t77 9.jpg
+t77 8.jpg|3T77
+t77 9.jpg|3T77
 </gallery>
+====3T77 Schematics====
+<gallery>
+t77 trigger schem.png | Trigger Schematic
+t77 block diagram.png | Block Diagram
+t77 connector and ps schem.png | Connector and Power Supply
+t77 horizontal amp schem.png | Horizontal Amp Schematic
+t77 staircase schem.png | Staircase Schematic
+t77 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
+t77a 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:560 series plugins]]