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.


Showing posts with label Apco. Show all posts
Showing posts with label Apco. Show all posts

Friday, January 28, 2011

APCO TV-12PAA YEAR 1974.





































The  APCO  TV-12PAA is a 12 Inches B/W portable television made for a brand called APCO from SANYO.

Apco Sales Inc in Roslyn Heights, NY is a private company categorized under Electrical Appliances, Television and Radio. Our records show it was established in 1971 and incorporated in New York.

Apco Sales Inc usually offer: Sanyo Televisions, Projection Televisions, American Tv And Appliance, 365 Radio and Amana Appliances.

This set came from Zurich were was marketed in the 70's.

It has manual tuning with rotary switch FOR VHF and Rotary for UHF.


..................OLD RELIABILITY PROBLEM:
 It's a well known fact that the reliability of Japanese made TV sets is better than that of European made ones. It works out something like this: for every call to a Japanese set during its first year you'll have to make two -three calls to its European counterpart. It's not quite as bad as that may sound. Call rates tend to lie in the region 0.5-1, which means at one end that half the sets won't require attention while at the other end each set will require one call per year. Then again these are average figures, and while many sets won't require attention at all others will have more than their fair share of breakdowns. Fortunately there has been an improvement in recent years - the situation was rather worse say four years ago. But then for the last couple of years we've been going through a period when the technical situation has remained fairly static. Will the new in -line gun tube chassis using the new ranges of i.c.s prove more or less reliable than their immediate predecessors? Only time will tell of course. But the unfavourable comparison between the failure rate of Japanese and European sets has been a continuing fact of life for several years. Is it to do with components, assembly methods, or basic design? Well, Japanese sets use much the same components and assembly methods, and the designs are not fundamentally all that different. Perhaps there is some subtler difference somewhere? Recent conversations we've had suggest that this could well be so. We can speak only of the European industry of course, but feel that the situation is probably much the same with our continental competitors. The first thing to bear in mind - and this relates to other industries, such as car manufacturers, as well - is the different industrial structures. Like the car industry, European TV setmakers tend to be assemblers of finished products rather than manufacturers of whole units. They buy in capacitors, resistors, semiconductor devices, many of the wound components, the tubes, probably the tuners and triplers and so on. This is far less the case in Japan, where most of what a setmaker uses comes from "in house" sources. All right you may say. But European component manufacturers have been in the game long enough to know what they're about - as long as anyone else for that matter. Furthermore, they've been working in close contact with the same setmakers, both facing and dealing with common problems. Why should this different industrial set-up make any difference? It's probably not so much the set-up itself so much as the fact that the way the European industry is organised tends to emphasise certain basic weaknesses. Quite substantial changes have occurred in even the most mundane components in recent years - component manufacturers are producing new types of capacitor and resistor that were simply not known a decade ago for example. But to do this successfully calls for adequate investment and the employment of adequate numbers of properly trained engineers and technical staff. In both these respects, European industry is notorious. It may well be said that in difficult economic times it's hardly possible to increase investment and take on extra trained staff, which is true enough. But the fact is that we are reaping the results of our past inadequacies, and a start hag to be made sometime if the situation is ever to be retrieved. The main problems seem to relate to know-how and technical liaison. Does the setmaker get a thorough and reliable service from his suppliers - and conversely has he set about ensuring that he does? It's not good enough today to continue on the basis that something worked reasonably well enough last time and the supplier says he hasn't had any particular complaints other than the usual ones. To achieve the degree of reliability required to continue to exist in a highly competitive international industrial climate, it's necessary to know precisely what order of tolerances under various operating conditions the various components offered and bought have. And this calls for adequate technical back-up and investment. The Japanese invest adequately and their engineers can get together within a single organisation to deal with common problems. It's not necessary for the European industry to be reorganised for the same to be done. What's required is a more powerful voice for the engineer, backed by adequate investment.

APCO TV-12PAA CHASSIS N°720 Code.5342 INTERNAL VIEW.


















































































 



This chassis is entirely based on discrete components and so compact to fit a small set like this.

Deflections are realized with:

2SB468 (HITACHI)

2SB341V (HITACHI)

A superheterodyne receiver having an automatic intermediate frequency control circuit with means to prevent the faulty regulation thereof. The receiver has means for receiving a radio frequency signal and mixing the same with the output of a superheterodyne oscillator. This produces an intermediate frequency signal which is coupled to a frequency or phase discriminator to produce an error signal for controlling the frequency of the superheterodyne oscillator. A regulation circuit is provided having an electronic switch to interrupt the feedback circuit when only unwanted frequencies tend to produce faulty regulation of the superheterodyne oscillator.



Power supply is realized with mains transformer and Linear transistorized power supply stabilizer, A DC power supply apparatus includes a rectifier circuit which rectifies an input commercial AC voltage. The rectifier output voltage is smoothed in a smoothing capacitor. Voltage stabilization is provided in the stabilizing circuits by the use of Zener diode circuits to provide biasing to control the collector-emitter paths of respective transistors.A linear regulator circuit according to an embodiment of the present invention has an input node receiving an unregulated voltage and an output node providing a regulated voltage. The linear regulator circuit includes a voltage regulator, a bias circuit, and a current control device.


In one embodiment, the current control device is implemented as an NPN bipolar junction transistor (BJT) having a collector electrode forming the input node of the linear regulator circuit, an emitter electrode coupled to the input of the voltage regulator, and a base electrode coupled to the second terminal of the bias circuit. A first capacitor may be coupled between the input and reference terminals of the voltage regulator and a second capacitor may be coupled between the output and reference terminals of the voltage regulator. The voltage regulator may be implemented as known to those skilled in the art, such as an LDO or non-LDO 3-terminal regulator or the like.

The bias circuit may include a bias device and a current source. The bias device has a first terminal coupled to the output terminal of the voltage regulator and a second terminal coupled to the control electrode of the current control device. The current source has an input coupled to the first current electrode of the current control device and an output coupled to the second terminal of the bias device. A capacitor may be coupled between the first and second terminals of the bias device.

In the bias device and current source embodiment, the bias device may be implemented as a Zener diode, one or more diodes coupled in series, at least one light emitting diode, or any other bias device which develops sufficient voltage while receiving current from the current source. The current source may be implemented with a PNP BJT having its collector electrode coupled to the second terminal of the bias device, at least one first resistor having a first end coupled to the emitter electrode of the PNP BJT and a second end, a Zener diode and a second resistor. The Zener diode has an anode coupled to the base electrode of the PNP BJT and a cathode coupled to the second end of the first resistor. The second resistor has a first end coupled to the anode of the Zener diode and a second end coupled to the reference terminal of the voltage regulator. A second Zener diode may be included having an anode coupled to the cathode of the first Zener diode and a cathode coupled to the first current electrode of the current control device.

A circuit is disclosed for improving operation of a linear regulator, having an input terminal, an output terminal, and a reference terminal. The circuit includes an input node, a transistor, a bias circuit, and first and second capacitors. The transistor has a first current electrode coupled to the input node, a second current electrode for coupling to the input terminal of the linear regulator, and a control electrode. The bias circuit has a first terminal for coupling to the output terminal of the linear regulator and a second terminal coupled to the control electrode of the transistor. The first capacitor is for coupling between the input and reference terminals of the linear regulator, and the second capacitor is for coupling between the output and reference terminals of the linear regulator. The bias circuit develops a voltage sufficient to drive the control terminal of the transistor and to operate the linear regulator. The bias circuit may be a battery, a bias device and a current source, a floating power supply, a charge pump, or any combination thereof. The transistor may be implemented as a BJT or FET or any other suitable current controlled device.



- The EHT Output is realized with a selenium rectifier.


The EHT selenium rectifier which is a Specially designed selenium rectifiers were once widely used as EHT rectifiers in television sets and photocopiers. A layer of selenium was applied to a sheet of soft iron foil, and thousands of tiny discs (typically 2mm diameter) were punched out of this and assembled as "stacks" inside ceramic tubes. Rectifiers capable of supplying tens of thousands of volts could be made this way. Their internal resistance was extremely high, but most EHT applications only required a few hundred microamps at most, so this was not normally an issue. With the development of inexpensive high voltage silicon rectifiers, this technology has fallen into disuse.A selenium rectifier is a type of metal rectifier, invented in 1933. They were used to replace vacuum tube rectifiers in power supplies for electronic equipment, and in high current battery charger applications.


The photoelectric and rectifying properties of selenium were observed by C. E. Fitts around 1886 but practical rectifier devices were not manufactured routinely until the 1930s. Compared with the earlier copper oxide rectifier, the selenium cell could withstand higher voltage but at a lower current capacity per unit area.