T7100: Difference between revisions

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-The '''Tektronix T7100'''  (P/N 154-0783-00 with P31 phosphor) is the CRT used in the [[7104]] and [[R7103]] analog 1 GHz scopes.
+{{CRT
+|Manufacturer=Tektronix
+|Model=T7100
+|Part_nos=154-0783-00
+|Description=[[micro-channel plate CRT]]
+|Used_in=7104; R7103
+|Designers=Dennis Hall;Aris Silzars;Conrad Odenthal
+}} used in the [[7104]] and [[R7103]] analog 1 GHz scopes.
 It features a [[micro-channel plate]] electron beam amplification stage.
 [[File:Micro-channel plate diagram.jpg | thumb | 550px | right | MCP diagram<br />(click image to enlarge)]]
-Compared to non-MCP high-speed tubes, the T7100 uses reduced beam current and acceleration voltage
+Compared to non-MCP high-speed tubes, the T7100 uses reduced beam current and acceleration voltage to achieve high deflection sensitivity, eliminating the need for high amplifier output voltages, thereby boosting amplifier bandwidth.
-to achieve high deflection sensitivity, eliminating the need for high amplifier output voltages, thereby boosting
-amplifier bandwidth.
-The electron beam passes through terminated helical deflection plates (both X and Y axes use
+The electron beam passes through terminated helical deflection plates (both X and Y axes use this form of [[distributed deflection plates]] to achieve the necessary bandwidth), followed by an electrostatic scan-expansion lens that increases deflection 4.5 times vertically and 4 times horizontally, before it hits the micro-channel plate (MCP).
-this form of [[distributed deflection plates]] to achieve the necessary bandwidth), followed by
-an electrostatic scan-expansion lens that increases deflection 4.5 times vertically and 4 times
-horizontally, before it hits the micro-channel plate (MCP).
 The deflection structures are described in [https://patents.google.com/patent/US4093891 US Patent 4,093,891].
-The scan-expansion lens is a "box lens" design, which is discussed on pages 53−55
+The scan-expansion lens is a "box lens" design, which is discussed on pages 53−55 of the ''[[Media:7104_maintenance.pdf|7104 maintenance document]]''.
-of the ''[[Media:7104_maintenance.pdf|7104 maintenance document]]''.
 The MCP consists of parallel channels of 25 μm diameter and offset at a slight angle to the beam.
-The inside walls of these channels are coated with resistive material, with a voltage of 700-1050 V applied
+The inside walls of these channels are coated with resistive material, with a voltage of 700-1050 V applied between back and front of the plate. Electrons entering a channel hit the wall where they initiate a cascade of secondary electron emission like in a [https://en.wikipedia.org/wiki/Photomultiplier photomultiplier].
-between back and front of the plate. Electrons entering a channel hit the wall where they initiate a cascade
-of secondary electron emission like in a [https://en.wikipedia.org/wiki/Photomultiplier photomultiplier].
 A final 10 kV potential accelerates the beam across a 3 mm gap toward the [[phosphor]] coating.
@@ Line 42: / Line 42: @@
 * [[Media:7104_maintenance.pdf|7104 maintenance document]], p.30+
 * [[T7101]]
+* [[Patent US 4142128A|US Patent 4142128A – Box-shaped scan expansion lens for cathode ray tube]] ([[Conrad Odenthal]])
+* [[Conrad Odenthal]], ''[[Media:Conrad Odenthal - A box-shaped scan expansion lens for an oscilloscope CRT.pdf|A box-shaped scan expansion lens for an oscilloscope CRT]] (1977)
+* [[Media:Box lens design being tried by Tektronix in experimental CRTs.pdf|Box lens design being tried by Tektronix in experimental CRTs]] (1977)
 ==Pictures==