Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and information about some of the electronic, electrical and electrotechnical Obsolete technology relics that the Frank Sharp Private museum has accumulated over the years .
Premise: There are lots of vintage electrical and electronic items that have not survived well or even completely disappeared and forgotten.

Or are not being collected nowadays in proportion to their significance or prevalence in their heyday, this is bad and the main part of the death land. The heavy, ugly sarcophagus; models with few endearing qualities, devices that have some over-riding disadvantage to ownership such as heavy weight,toxicity or inflated value when dismantled, tend to be under-represented by all but the most comprehensive collections and museums. They get relegated to the bottom of the wants list, derided as 'more trouble than they are worth', or just forgotten entirely. As a result, I started to notice gaps in the current representation of the history of electronic and electrical technology to the interested member of the public.

Following this idea around a bit, convinced me that a collection of the peculiar alone could not hope to survive on its own merits, but a museum that gave equal display space to the popular and the unpopular, would bring things to the attention of the average person that he has previously passed by or been shielded from. It's a matter of culture. From this, the Obsolete Technology Tellye Web Museum concept developed and all my other things too. It's an open platform for all electrical Electronic TV technology to have its few, but NOT last, moments of fame in a working, hand-on environment. We'll never own Colossus or Faraday's first transformer, but I can show things that you can't see at the Science Museum, and let you play with things that the Smithsonian can't allow people to touch, because my remit is different.

There was a society once that was the polar opposite of our disposable, junk society. A whole nation was built on the idea of placing quality before quantity in all things. The goal was not “more and newer,” but “better and higher" .This attitude was reflected not only in the manufacturing of material goods, but also in the realms of art and architecture, as well as in the social fabric of everyday life. The goal was for each new cohort of children to stand on a higher level than the preceding cohort: they were to be healthier, stronger, more intelligent, and more vibrant in every way.

The society that prioritized human, social and material quality is a Winner. Truly, it is the high point of all Western civilization. Consequently, its defeat meant the defeat of civilization itself.

Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

OLD, but ORIGINAL, Well made, Funny, Not remotely controlled............. and not Made in CHINA.

How to use the site:
- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

Every CRT Television saved let revive knowledge, thoughts, moments of the past life which will never return again.........

Many contemporary "televisions" (more correctly named as displays) would not have this level of staying power, many would ware out or require major services within just five years or less and of course, there is that perennial bug bear of planned obsolescence where components are deliberately designed to fail and, or manufactured with limited edition specificities..... and without considering........picture......sound........quality........
..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

Have big FUN ! !
©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All sets and apparates appearing here are property of Engineer Frank Sharp. NOTHING HERE IS FOR SALE !
All posts are presented here for informative, historical and educative purposes as applicable within Fair Use.

Tuesday, July 26, 2022


This invention relates to the manufacture of color television picture tubes incorporating shadow masks, and more particularly to such tubes utilizing the so-called "Black Matrix".

One serious drawback of the standard shadow mask tube is the appearance of its picture viewed in daylight conditions or high ambient lighting conditions. In the standard shadow mask tube there are two principal factors contributing to this deficiency. Firstly, in order to accommodate beam landing errors the diameters of the phosphor dots are made larger than those of the beams, and secondly the spaces surrounding these dots is covered by a highly reflective aluminum coating. These two factors together mean that approximately 10% of the screen area is never excited by any electron beam but will nevertheless diffusely reflect ambient light and hence impair the appearance of the picture. In order to reduce this effect to acceptable limits a dark-tint face plate is used. This reduces, by a certain factor, the brightness of the reflected ambient light; but it also reduces, though only by half that factor, the brightness of the picture. Thus although there is a net improvement in appearance, the general level of picture brightness is reduced. This effect can be compensated by driving the phosphor harder, but this reduces the life of the tube. Taking this fact into consideration a face plate with approximately 50% transmission is generally considered a reasonable compromise.

A novel approach to the problem is firstly to arrange to accommodate beam landing errors by making the electron beams larger than the visible portions of the dots, and secondly to fill the space between these portions with a non-reflecting coating.

With this arrangement, if only 50% of the screen area is excited by electron beams and the remainder is substantially non-reflecting, then an 80% transmission face plate could be used, thereby providing a 54% increase in brightness with a 30% better contrast ratio between the picture and the reflected ambient light.

The arrangement can be achieved in principle by producing an appropriate pattern of holes in a black coating on the inside of the tube facce. The holes are made undersize on the standard phosphor dots which are subsequently superimposed on these holes. The diameters of the electron beams are again standard size but beam landing errors are accommodated by virtue of the fact that the effective light emitting area of each phosphor dot is restricted to that portion lying in its associated hole.

A critical step in this process is the production of the pattern of undersize holes. Since a shadow mask is unique to a tube this pattern can only be achieved by a technique which involves the temporary reduction in size of the apertures of a shadow mask.

Two methods have previously been proposed. One of these involves making the shadow mask with undersize holes which are subsequently enlarged by etching after it has been used to make the pattern of undersize holes in the black coating. The other method involves using a shadow mask with standard size holes which is then plated with a different metal to reduce their size. After the pattern of undersized holes in the black coating has been made the holes of the shadow mask are opened out again to their original size using a selective etch which will remove the plated layer, but which will not attack the underlying material from which the shadow mask is constructed. Both these methods are complicated by the fact that the enlargement of the holes has to be performed after the shadow mask has been fitted to its supporting frame and formed. It will be realized that there is a risk of trapping the etching solution between the mask and its frame which may cause contamination within the completed tube. A further disadvantage of the plating method is that it is time consuming and expensive on materials. Yet another disadvantage of methods involving the use of etching solutions is that they are liable to remove the oxide layer created during the forming of the shadow mask. If this oxide layer has to be recreated by a further heat treatment there is a serious risk that the shadow mask will slightly change its shape and thus lose its compatibility with the deposited pattern of phosphor dots.

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