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 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 ! !
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©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 !

Thursday, February 23, 2012

TELEFUNKEN 2423 CHASSIS T524/1 CRT TUBE TELEFUNKEN A61-120W.












TELEFUNKEN CATHODE ARRANGEMENT AND CATHODE-RAY TUBE HAVING SUCH A CATHODE ARRANGEMENT:
In a cathode-ray tube cathode arrangement having a cup-shaped control electrode provided with an aperture in its end wall, a cup-shaped cathode sleeve having an end face provided with emission material and arranged in the control electrode with its end face adjacent the aperture, and a disc of insulating material arranged within the control electrode to support the cathode sleeve therein, with the end face of the cathode sleeve spaced from the apertured wall of the control electrode by a suitable spacing means, the ceramic disc is provided with a plurality of wedge surfaces and associated recesses to permit the disc to be inserted into the control electrode past a plurality of projections formed on the inner wall of the control electrode and to then be turned so as to become removably wedged into place between the spacing means and the projections.


1. A cathode arrangement comprising, in combination: 2. A cathode arrangement as claimed in claim 1 wherein said disc is of a ceramic material and has a plurality of wedge surfaces each with an associated recess, and there are a plurality of projections each associated with a respective wedge surface. 3. A cathode arrangement as claimed in claim 2, wherein there are an equal number of said projections and said wedge surfaces. 4. A cathode arrangement as claimed in claim 3, wherein there are two wedge surfaces, each with an associated recess, and two projections which are distributed symmetrically around the circumference of said disc and said control electrode, respectively. 5. A cathode arrangement as claimed in claim 3, wherein there are three wedge surfaces, each with an associated recess, and three projections which are distributed symmetrically around the circumference of said disc and said control electrode, respectively. 6. A cathode-ray tube having a cathode arrangement as defined in claim 2, wherein said cathode arrangement is provided with an equal number of said projections and said wedge surfaces. 7. A cathode-ray as claimed in claim 6, wherein said tube is a television picture tube. 8. A cathode-ray tube as claimed in claim 7, having three electron-beam generating systems each provided with said cathode arrangement. 9. A cathode-ray tube as claimed in claim 8, wherein each cathode arrangement is provided with two wedge surfaces, each with an associated recess, and two projections which are distributed symmetrically around the circumference of said disc and said control electrode, respectively. 10. A cathode-ray tube as claimed in claim 8, wherein each cathode arrangement is provided with three wedge surfaces, each with an associated recess, and three projections which are distributed symmetrically around the circumference of said disc and said control electrode, respectively.
Description:
The invention relates to a cathode arrangement having a cup-shaped cathode sleeve which is provided at the end with emission material and which is held inside a cup-shaped control electrode by means of an insulating disc which preferably consists of ceramic, the insulating disc being presses, by wedging, against one or more shoulders provided in the control electrode.

In cathode-ray tubes, particularly oscillograph tubes and television picture tubes, the cathode consists of a cup-shaped cathode sleeve of metal, in the interior of which there is provided an electrical heating element and on the outer end of which there is provided an emission material. The insulated mounting of such a cathode sleeve is generally effected by means of a ceramic disc which is secured in a cup-shaped control electrode (Wehnelt Cylinder). In the center of the end face, the control electrode has an aperture for the passage of electrons which is opposite the emission surface and separated therefrom by a short distance. The short distance between the emission surface and the control electrode aperture is usually maintained by a spacer having a shoulder and inserted in the control electrode, or by shoulders, for example in the form of an annular constriction provided in the control electrode, against which the insulating disc is pressed with the cathode sleeve secured in its central aperture. The pressing of the insulating disc against the shoulder determining the spacing is effected, as is known, by pressing in beads, bending tongues at an angle, twisting tongues or inserting resilient clips.

SUMMARY OF THE INVENTION

It is the object of the present invention to provide a novel cathode arrangement of the aforesaid kind which renders simple and reliable holding of the cathode sleeve possible inside the control electrode and which permits replacement of the cathode sleeve inside the control electrode in a simple manner.

According to the invention, it is proposed that projections should be provided on the inner wall of the control electrode and that the insulating disc should have wedge surfaces which gradually vary the thickness thereof in the circumferential direction and which, on rotation of the insulating disc, cause a wedgelike locking thereof between the shoulder and the projections.

The mode of securing the insulating disc inside the control electrode according to the invention has the advantage that the cathode sleeve together with the insulating disc can be removed from the control electrode again at any time and replaced by another one. The replacement of the cathode is particularly important when a completely or partially manufactured electron tube proves unservicable and has to be reopened in order to remove the damage causing the disturbance. This damage may have occurred to the cathode itself or elsewhere, for example to the luminescent screen of a television picture tube. Since contact with air generally damages the formed cathode, the whole electrode system would have to be thrown away if the cathode could not be replaced. The possibility of replacing the cathode is therefore particularly desirable if the electrode system is extensive and expensive. A preferred use for the cathode arrangement according to the invention is therefore in television picture tubes and more particularly in color television picture tubes. The electrode systems of color television picture tubes consist of a plurality of, preferably three, electron-beam generating systems, and are relatively expensive, so that replacement of the three cathodes in the event of repair to the tube saves considerable expense because the remaining cathode system can be used again after insertion of new cathodes. Additional electrodes for producing convergence of the three electron beams (convergence electrode) are generally secured to the electrode systems for color television picture tubes, and these consist partially of expensive materials and would have to be thrown away with the electrode system if replacement of the three cathodes were impossible. The invention therefore leads to particular advantages in conjunction with color television picture tubes.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 5 show an example of a preferred embodiment of the invention in various views, or different parts thereof.

FIG. 1 shows a view from below of the cathode arrangement according to the invention;

FIG. 2 shows a cross section therethrough;

FIG. 3 shows a side view thereof;

FIG. 4 shows a side view partially in section and

FIG. 5 shows a portion of a cross section of the cathode arrangement according to the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

The circular cylindrical control electrode 1, also called a Wehnelt Cylinder, consists in known manner of a cup-shaped structure, the end face 5 of which has a central aperture 12 for the passage of the beam. Opposite the aperture 12 for the passage of electrons, with short spacing, is the emission layer 11 of the cup-shaped cathode sleeve 2 in the interior of which, an electrical heating element is mounted with insulation in the usual manner. The mounting of the cathode sleeve 2 inside the cavity of the control electrode 1 is effected with the aid of an insulating disc 6 consisting preferably of ceramic. The securing of the cathode sleeve 2 to the insulating disc 6 is effected in any known manner, with precision, so that the emission surface 11 of the cathode sleeve 2 extends to a specific extent over the area 10 of the insulating disc. In order to set a defined spacing between the end face of the cathode sleeve coated with emission material 11 and the inner face of the end wall 5 of the control electrode 1, a spacing ring 4 is provided which is inserted in the control electrode 1 and against which there is pressed the insulating disc 6. Projections or shoulders, particularly an annular shoulder, could naturally be provided on the cylindrical inner wall of the control electrode 1 instead of the spacing ring 4, and the insulating disc 6 be pressed against them.

According to the invention, projections 3 which extend inwards and which consist of mechanically produced impressions in the material, are provided at the inner wall of the control electrode 1. These projections are preferably impressed by means of a semicircular punch so that the material is partially torn as illustrated in FIG. 5.

Furthermore, the insulating disc according to the invention has inclined wedge surfaces 8 at its circumference. In particular, two or three of these wedge surfaces are provided which extend over a portion of the circumference. The wedge surfaces are provided by the fact that the thickness of the insulating disc varies gradually in the region of the wedge surfaces. The individual portions of wedge surface at the circumference of the insulating disc, together with the opposite plane face of the insulating disc, does form wedges to a certain extent. The wedge surfaces are provided at the face 9 in the insulating disc 6 remote from the emission surface 11. The face 10 of the insulating disc 6 adjacent to the emission surface 11 is plane, at least in the regions where the insulating disc rests on the shoulders or the distance ring 4, and is perpendicular to the longitudinal axis of the cathode sleeve 2.

The wedge surfaces according to the invention on the insulating disc may also be regarded as approximately sections of the surface of a screw thread. Associated with each wedge surface is a recess 7 in the insulating disc 6 starting at the circumference. The purpose of these recesses 7 is to enable the insulating disc to be inserted in the control electrode 1 which is effected in such a manner that the projections 3 on the control electrode slide through the recesses 7 during insertion. If, after the insertion of the insulating disc in the control electrode, this rests on a shoulder (not shown) or on the spacing ring 4, the ceramic disc is turned whereupon the wedge surfaces 8 engage below the projections 3 and as the turning continues, the insulating disc is firmly wedged between the spacing ring 4 and the projections 3. Each wedge surface in the insulating disc is associated with a projection on the control electrode. The arrangement of the wedge surfaces and of the projections is preferably effected so that they are distributed symmetrically round the circumference.

If the projections 3 extending inwards in the wall of the control electrode of the invention are formed in such a manner that the material tears partially as illustrated in FIG. 5, sharp edges are obtained on these projections 3 and, as a result of increased friction against the insulating disc, prevent this from being accidentally loosened. As a result of deliberate turning of the insulating disc 6 in the opposite direction, the insulating disc together with the cathode sleeve 2 can be loosened again and removed from the control electrode 1.

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