Talk:Video camera tube

message: My recollections of camera tube types are that there is a difference between the "Orthicon" and the "Image Orthicon" tubes.
The Image Orthicon was developed out of the Orthicon tube which was invented by Arthur Rose in 1937/38. The Orthicon had no what we used to call "Image Amplifier" located in the larger section at the front of the Image Orthicon tube.
So, for the article to be correct, the heading “Orthicon” should really be changed to “Image Orthicon”, the words "or simply orthicon tube" removed and another heading and description for its ancestor the “Orthicon”. 
I’m having a problem locating technical information about the Orthicon (sans Image) tube but I found a diagram and a bit more information at: http://members.chello.nl/~h.dijkstra19/page4.html and an IEEE reference at: http://www.ieee.org/organizations/history_center/legacies/rose.html.
In Australia we were using Image Orthicon cameras at least into the 1970's. Fernseh brought out the only solid state   Image orthicon camera I know of in about 1968.
We referred to the tubes as "IO's".
Peter Resch 06:39, 28 April 2006 (UTC)
thread_title:  Orthicon or Image Orthicon 

message: The nickname 'emmy' came from another tube from the same family, the Emitron (or CPS Emitron). (for more, see http://www.burle.com/cgi-bin/byteserver.pl/pdf/pctdhbook.pdf which is based from original source material, see its footnotes)  The Image Orthicon, or IO, and the emitron, or CPS Emitron, both used a mosaic type photoemitter. 
Regarding the comment above, I believe he's talking about the earlier Multiplier Orthicon. The MO tube had an electron multiplier in it that amplified the signal prior to sending it to the video amp so as to produce a stronger but still relatively clean input signal. But the IO tube also had a multiplier built in for the same purpose, but also had a two-sided target. And both were sent to a video amplifier. The multipliers were to boost the weak source signal. On principle I agree with the notion of making the heading just 'Orthicon', but generally when people talk about orthicon tubes, they're talking about IO tubes as they were the more advanced and in more widespread use.
140.247.121.204 (talk) 15:18, 20 March 2008 (UTC)
thread_title:  Elaboration on above comment and 'emmy' correction 

message: In the TV series Monty Python's Flying Circus, they used EMI 2001's with Plumbicons. In one episode, Episode 17, a model of a building exploded and caused the camera to show a glowing red and green halo and then it faded away. Was this a malfunction? Curvebill 18:48, 9 September 2007 (UTC)
replies: text: Plumbicon based cameras were the mainstay of earlier BBC colour broadcasts (and of most other broadcasters of the time).  The effect you describe was a characteristic of the plumbicon tubes.  It was obserevable on many other programmes where bright lights or light reflections were included in shot.  The colour change came about because the decay of the image on the target of the tube was different in the three tubes with the green having the longest delay.  This was because the composition of the targets differed between the tubes to optimise the response to the colour it saw (red, green or blue). 86.134.120.174 (talk) 14:58, 3 February 2010 (UTC)
thread_title: Plumbicon Tubes

message: *I rewrote the subsection Operation of the Image Orthicon to be more precise and accurate. I based myself in Radio Engineering by Frederick Terman from 1947. I would like to cite it as a source, however it applies to the whole subsection, rather than a part of it, so I don't know where to put it. Finally, I don't think the copy-edit note should stay for the Image Orthicon section, what do you think? Should we remove it? Regards! Alchaemist (talk) 03:57, 13 March 2009 (UTC)
thread_title:  Image Orthicon copy-edit 

message: One of the first all-electronic video camera tubes 
was invented in France by Edvard-Gustav Schoultz in 1921.
He filed the French patent FR-539-613 on August 23, 1921. 
The patent was accepted on April 5, 1922, and published 
on June 28, 1922. You can find a copy of the original 
document in the web page 
[] 
The Image Dissector was also invented in Germany by Max 
Diekmann and Rudolf Hell in 1925. They filed the German
patent DE-450-187 on April 5, 1925. The patent was accepted
on September 15, 1927, and published on October 3, 1927.
You can find a copy of the original document in the web page
[]
--134.153.204.160 (talk) 15:47, 24 July 2009 (UTC)
thread_title:  Two Historical Notes 

message: Reading through a couple times, it seems like everything after the "Vidicon" section should probably be part of the "Vidicon" section.  The plumbicons and saticons and whatnot are all just types of vidicons, right? 24.174.30.146 (talk) 03:56, 16 August 2009 (UTC)
replies: text: Yup. They differ only in the chemical composition of the photosensitive layer. 76.27.195.28 (talk) 05:30, 16 August 2009 (UTC)
thread_title: Vidicon reorganization?

message: I added a small mention to a color system that is more simple to the NTSC.
There is a link to the patent of that system in the article Guillermo González Camarena.
I am not an electrical engineer capable understand and describe the whole system.
I knew about it in a TV program about this invention I saw it in a B&W TV set. 
That program included a small demonstration of the system it was saw in color in my B&W TV set. 
They explained it is an optical illusion that allow us to see colors in a B&W TV by varying the frequency of light. 
I understood it as something similar to the mpeg sound compression system, but I am not sure, so I did not mentioned that in wikipedia.
If someone can understand that patent and extend the explanation it could improve this article. More over it maybe deserves a new article about this not widely known interesting system.  —Preceding unsigned comment added by Elias (talk • contribs) 15:06, 16 February 2010 (UTC)
replies: text: Camarena received a patent for a color-wheel television system in 1942, which allowed viewing of a color image on a B&W CRT.  I have revised the section to reflect this, and to improve the technical explanation of the method.  I haven't found any references indicating that Camarena developed any kind of TV system which would allow viewing a color image on a B&W CRT without a color wheel.  If you have seen a color image demonstrated on a B&W TV without a color wheel, it probably wasn't Camarena who invented the method. Wildbear (talk) 08:35, 29 March 2010 (UTC)
thread_title:  Guillermo González Camarena system 

message: I didn't know about this, and don't doubt that it happened. However, the photoconductive film in a vidicon is deposited on the inside surface of the faceplate, and the faceplate is typically thick enough not to respond to any sounds that wouldn't cause instant deafness, I'd estimate. It does, after all, need to be more than rugged enough to withstand atmospheric pressure. Moreover, the lowest resonant frequency of the faceplate is very likely to be well into the ultrasonic range, because it's so stiff. There must be a different explanation, perhaps the electron gun?
I didn't want to just jump in and trash that paragraph, though! Regards, Nikevich (talk) 15:18, 31 March 2010 (UTC)
replies: text: 'Tis indeed the electrodes in the gun. 86.182.66.217 (talk) 15:42, 22 May 2010 (UTC)
thread_title:  Audio ("microphonic") sensitivity of vidicons 

message: This article appears to have been tagbombed by  tags being inserted at almost every sentence that does not have a specific citation.  This includes much material that is just plain obvious and much that is covered by a citation earlier in the section. 
I propose that these tags be removed in their entirety.  If there are points made that are genuinely challeneable, then tags can be reinserted as required. 86.182.66.217 (talk) 15:40, 22 May 2010 (UTC)
thread_title:  Tagbombed 

message: It would be important to mention.
Mr. Farnsworth’s Dissector tube has no relationship with the iconoscope. It can easily be established when looking at the drawings of Mr. Farnsworth’s patent no. 1,773.980 that his camera is not housed in a so-called Braun tube: it does not have a cathode ray beam which would sweep across a photoraster and it does not have storage, among many other essential features!
Earliest patents of Iconoscope VS Earliest patents of I.Dissector. According to Farnsworth’s early patent :no. 1,773.980, I.Dissector hadn't braun tube it does not have a cathode ray beam which would sweep across a photoraster  — Preceding unsigned comment added by 84.2.22.21 (talk) 19:36, 22 September 2011 (UTC)
thread_title: Earliest patents of Iconoscope VS Earliest patents of I.Dissector

message: The introduction was very strange. It spoke about the American English word, "Cathode Ray Tube", and other issues, without describing the object this article is about. I completely rewrote the introduction to provide the interested layman with a succinct summary of what a "video camera tube" is.  Nick Beeson (talk) 11:32, 19 June 2014 (UTC)
thread_title:  introduction rewrite 

message: The second and third sections repeatedly refer to "transmission" in a way that makes no sense.   Is it an inapposite translation from another language ?   Any normal educated person would think that "transmission" is refering to the high-frequency radio broadcasts used to disseminate television.  Sure,  in the early days,   this was also a bigger technical challenge,   but it really has not much to do with the video tubes which were at the heart of a TV camera.     Here,  however,  the word "transmission" appears to be being used in some strange sense,   to refer to the actual capture of the image into electronic form -  which is what the "video camera tube" does.    By way of example,  there are references to the "photoelectric effect".  That has a lot to do with how the video camera tube works,   and nothing to do with broadcast transmissions.  Perhaps it needs attention from an english-speaking expert.Lathamibird (talk) 04:47, 20 February 2015 (UTC)
thread_title:  Transmission 

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thread_title:  External links modified 

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message: I have no dog in the Farnsworth/Zworykin debate. Perhaps due to overzealous editing in the wars of attribution, the first time Zworykin's name appeared as I encountered the article in January 2018 was under "Iconoscope", this way:
:"Zworykin presented in 1923 his project for a totally electronic television system to the general manager of Westinghouse."
No introduction of who any such "Zworykin" might be, or even whether he was employed by Westinghouse at the time. The only previous mention of his name was in the photo captions. I added a bare introduction and a couple of refs regarding nothing more than Zworykin's commencement of his work at Westinghouse. If you want to do wholesale rip and roast, at least have the courtesy to read the copy of the article over again before publishing, to preserve a semblance of continuity. Rt3368 (talk) 12:06, 25 January 2018 (UTC)
thread_title:  Paragraph repair