Obsolete Technology Tellye !

True Televisions have the CRT Tube !! Welcome to the Obsolete Technology Tellye Web Museum. Here you will see a TV Museum showing many Old Tube Television sets all with the CRT Tube, B/W ,color, Digital, and 100HZ Scan rate, Tubes technology. This is the opportunity on the WEB to see, one more time, what real technology WAS ! In the mean time watch some crappy lcd picture around shop centers (but don't buy them, or money lost, they're already broken when new) !!!

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 ! !
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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 !
All posts are presented here for informative, historical and educative purposes as applicable within Fair Use.

Saturday, December 18, 2010

TOSHIBA mod nr. 201R3W3 CRT TUBE MULLARD (PHILIPS) A51-590X VIEW.

CRT TUBE MULLARD (PHILIPS) A51-590X

Hi-bri COLOUR PICTURE TUBE

•90° deflection
•In-line gun, thermally stable; electrostatic hi-bi potential for improved focus

• 29, 1 mm neck diameter
• Hi-Bri screen with pigmented phosphors featuring high brightness and increased contrast performance
• Soft-Flash technology offering improved set reliability
• Slotted shadow mask optimized for minimum moire
• Fine pitch over entire screen
• Phosphor lines follow glass contour
• Quick-heating cathodes
• Internal magnetic shield
• Reinforced envelope for push-through mounting
• When combined with an appropriate hybrid saddle toroidal deflection unit (e.g. AT1236 or AT1480),
it forms a self-converging and raster correction free assembly.

FLASHOVER PROTECTION
With the high voltage used with this tube (max. 27,5 kV) internal flashovers may occur. As a result of
the Soft-Flash technology these flashover currents are limited to approx. 60 A offering higher set
reliability, optimum circuit protection and component savings.
Primary protective circuitry using properly grounded spark gaps and series isolation resistors (preferably
carbon composition) is still necessary to prevent tube damage. The spark gaps should be connected to
all picture tube electrodes at the socket according to the figure below; they are not required on the
heater pins. No other connections between the outer conductive coating and the chassis are permissible.
The spark gaps should be designed for a breakdown voltage at the focusing electrode (g3) of 11,5 kV
( 1,5 x Vg3 max. at Va,g4 = 25 kV), and at the other electrodes of 1,5 to 2 kV.
The values of the series isolation resistors should be as high as possible (min. 1,5 kn) without causing
deterioration of the circuit performance. The resistors should be able to withstand an instantaneous
surge of 20 kV for the focusing circuit and 12 kV for the remaining circuits without arcing.

Notes
1. Absolute maximum rating system.
2. The X-ray dose rate remains below the acceptable value of 0,5 mR/h, measured with ionization
chamber when the tube is used within its limiting values.
3. During adjustment on the production line this value is likely to be surpassed considerable. It is
therefore strongly recommended to first make the necessary adjustments for normal operation with-
out picture tube.
4. Operation of the tube at lower voltages impairs the luminance and resolution.
5. The short-term average anode current should be limited by circuitry to 1500 μA.
6. For maximum cathode life and optimum performance, it is recommended that the heater supply be
designed for 6,3 Vat zero beam current.

Mullard Limited was a British manufacturer of electronic components. The Mullard Radio Valve Co. Ltd. of Southfields, London, was founded in 1920 by Captain Stanley R. Mullard, who had previously designed valves for the Admiralty before becoming managing director of the Z Electric Lamp Co. The company soon moved to Hammersmith, London and then in 1923 to Balham, London. The head office in later years was Mullard House in Torrington Place, Bloomsbury, which is now part of University College London.

Factories

Mitcham

Mullard opened a new manufacturing plant at Mitcham, Surrey in 1929. A second building was added in 1936. Both buildings had a very distinctive flat roof construction and were very similar to those at Philips' headquarters in Eindhoven, Netherlands. Co-sited with the Mullard buildings was the manufacturing complex for Philips Radios. Mitcham was also home to the Mullard Application Laboratory.

Blackburn

In the late 1930s Mullard opened a new plant in Blackburn, Lancashire. By 1949 Mullard had produced a number of television sets, such as the MTS-521 and MTS-684. In 1951 Mullard was producing the LSD series of photographic flash tubes.

Others

Mullard had factories in Southport and Simonstone, Burnley both in Lancashire. The latter was closed in 2004. There was also a sister factory in Durham. Other factories included those at Fleetwood (closed in 1979) and Lytham St. Annes (closed in 1972). A feeder factory at Haydock closed in 1981.

Partnership with Philips

In 1923, in order to meet the technical demands of the newly formed BBC, Mullard formed a partnership with the Dutch manufacturer Philips. The valves (US vacuum tube) produced in this period were named with the prefix PM, for Philips-Mullard, beginning with the PM3 and PM4 in 1926. Mullard finally sold all its shares to Philips in 1927. In 1928 the company introduced the first pentode valve to the British market.

Teletext

In the early 1980s, Mullard manufactured some of the earliest teletext decoding modules made in the UK.

Semiconductors

Mullard owned semiconductor factories in Southampton and Stockport. Both sites are now owned by NXP Semiconductors (formerly Philips Semiconductors). The one in Hazel Grove, Stockport specializes in power semiconductor devices.
The first transistors produced by Mullard were the OC50 and OC51 point-contact types, which were not widely used. In 1953 Mullard moved to junction transistors, beginning with the plastic-cased OC10 series. These were followed by the glass-encapsulated OC70 and OC80 series (the output devices were metal encapsulated to facilitate heatsinking), which were produced in large numbers and copied by other companies, such as Valvo (another Philips subsidiary), Intermetall and Siemens in Germany, and Amperex in the USA. In 1964 the company produced a prototype electronic desktop calculator as a technology demonstrator for its transistors and cold cathode indicator tubes.

Space science

In 1957 Philips-Mullard helped to set up the Mullard Radio Astronomy Observatory (MRAO) at the University of Cambridge. In 1966 the Mullard Space Science Laboratory (MSSL) was opened near Dorking, Surrey as part of University College London. The Royal Society Mullard Award^[1] for young scientists and engineers was set up in 1967.

Mullard brand name

Philips continued to use the brand name "Mullard" in the UK until 1988. Mullard Research Laboratories in Redhill, Surrey then became Philips Research Laboratories. As of 2007, the Mullard brand has been revived by Sovtek, producing a variant of the ECC83 and EL34.

Z Electric Lamp Company

The Z Electric Lamp Co. continued business into the 1970s operating from premises in Thornton Heath near Croydon, Surrey, England manufacturing lamps of specialised design. However, they went out of business due to the recession brought about by the high inflation of the mid 1970s.