Talk:AC/DC receiver design

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Clean up talk page[edit]

Congrats everybody involved! I have asked User:BDD, the admin that moved the page, to install archives and get rid of the past talks. Most of the chatter is about moving the article, article naming, subject matter that was attempted to be changed repeatedly and all water under the bridge now. Any objections of comments it is on his/her talk page. 174.118.142.187 (talk) 21:57, 12 June 2013 (UTC)[reply]

You may want to take a look at User:MiszaBot/Archive HowTo? K7L (talk) 21:59, 12 June 2013 (UTC)[reply]
Thanks but no thanks! After millions of lines of code I hate writing anything and I never really had an interest in this article, in the first place, after being involved in repairing the junk for a few years. Got my toe wet with a grammar fix and now I just want to take the hook out of my mouth. :) 174.118.142.187 (talk) 22:16, 12 June 2013 (UTC)[reply]
I modified the auto archive parameter to old=62 days, as this is not a very active page every month. Minthreadsleft=4 is good, it prevents the talk page becoming desolate looking, which is uninviting to new questions. --SmokeyJoe (talk) 22:53, 12 June 2013 (UTC)[reply]

Article lede.[edit]

Following on from the move of the article to AC/DC receiver design, I have changed the lede of the article to the most recent version discussed above. This addresses the fact that the article does not discuss receiver design in general, but only where the AC/DC receiver differs from its AC only counterpart. As always, feel free to improve it. DieSwartzPunkt (talk) 11:06, 13 June 2013 (UTC)[reply]

Unreliable sources and synthesis[edit]

@Pol098: I am not having a problem with the claim that the Pye B18T was the first television to feature an AC/DC type design (because as far as I am aware, it was). My problem is that it is not adequately referenced. I am not happy with the newly supplied Science Museum reference because it does not specifically state that it was the first such TV in the world. It says that it was, "the first television to use the AC/DC type of power supply", but there is a potential implication that this was in its target market since there was, at that time, no world market for any specific television design. Thus the world first status has been WP:SYNTHESISed from this source.

I have had to remove the valve page again because it is wholly unacceptable as a source for any material. It is a WP:FANSITE run by an individual without any obvious links to any authoritative source on the subject and is a non permitted source under criterion 11 of WP:LINKSTOAVOID. It also happens to be full of incorrect information (not to mention gramatical and spelling errors). For example: it claims for the Pye B18T that, "the EHT was generated by rectifying the high voltage pulses generated across the (line) scan coils". Not only is this not true, it is actually impossible because the scan coils are deliberately designed to have as little inductance as possible (comensurate with their purpose of producing a magnetic field) to allow a rapid fly-back. The reference contradicts itself later on by stating, "The method of EHT generation was not however without its difficulties due to the extreme transformer insulation requirements of the EHT winding of the line output transformer". The B18T like most AC/DC designs did use an overwind on the line-scan inductor (turning it into what became technically misnamed as a line-output transformer) to produce the high voltage for the tube. It was misnamed because the 'output transformer' was never intended to match the impedance of the scan coils to the line output stage, which is what a true output transformer would do. Indeed the scan coils are usually connected in series with the transformer primary (though a few designs did have some more esoteric arrangements). All projection televisions of the time used a line-scan inductor (i.e. without any secondary windings) and a separate 25-30 kV EHT generator, in early designs directly mains powered but later a self contained oscillator/transformer/rectifier.

The valve page also talks about the energy being recovered from the scan coils being used to boost the HT supply. Once again this is incorrect as the energy is recovered from the line-output transformer not the scan coils. --Elektrik Fanne 12:51, 20 July 2016 (UTC)[reply]

External links modified[edit]

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