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.

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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 !

Saturday, January 29, 2011

VOXSON Mod. 1202 CHASSIS 4-55-19270 INTERNAL VIEW.




























































































This VOXSON Mod. 1202 CHASSIS is amazing.

Power supply is realized with an AD142 which is a germanium Transistor.



The tuning circuits has a large knob potentiometers tuning system which use voltage controlled capacitances such as varactor diodes as the frequency determining elements.

Therefore a stable AFC circuit is developed:

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.

9 comments:

  1. Hi Frank!

    I have exactly the same TV, but it doesn't work. I took it to a video specialist to have it repaired, but the guy sad that in order to fix it he would need a wiring diagram. I don't have anything like that and had no luck on google either.
    Do you still have the manual or any technical documents for this TV? I am glad for anything helpful!

    Regards,
    Sarah

    ReplyDelete
  2. Sarah,

    On top of all, one First thing:
    what's wrong with the tellye ?

    This is important !


    Second, a skilled TV Engineer technician doesn't need the schematic for such relatively simple TV chassis !

    ReplyDelete
  3. Hi Frank,

    the technician said that the the line synchronization is corrupt (it has slipped ? - I don't really know how to explain this correctly, because English is not my native language and I have very little knowledge of all the technical terms).
    the sound does work perfectly and the picture tube is undamaged, so I think it should be no big problem to get the tellye working again.

    Thanks for the quick reply,
    Sarah

    ReplyDelete
  4. Hi Sarah,

    Good to read that the telly is at least powering up and running even only with "voice".

    Your technician doesn't say the truth. It uses a incoerent technical language which doesn't reflect any real fault in a Tellye line synchronization stage circuit.

    Anyway:

    1 - How did you connect the tellye to test it ?

    This is important because it may be the real problem.

    2 - Did you have at least a picture even only noise (I.E. like running it without antenna should give a sparkly / noise white screen picture ) ?

    (Your english is fine).

    FRANK.

    ReplyDelete
  5. Hi Frank,

    I see on your blogger profile that you are located in Germany, so I will give it a try and try to explain in German :-)

    Ich hatte mir zunächst einen UHF/VHF Modulator gekauft, in den ich über Chinch Anschlüsse ein Signal von meinem Laptop einspeise (das Bildsignal geht vorher nochmal durch einen digital-zu-analog Wandler).
    Von dem Modulator aus geht dann ein Koaxialkabel zum Fernseher, angeschlossen über einen Adapter an die UHF und VHF-Anschlüsse des TVs.
    Ton kam so problemlos an, Bild leider nicht. Allerdings sieht man nicht mehr den Schnee der ganz ohne Signal entsteht, sondern ein graueres, weniger rauschendes Bild was sich auch ändert wenn man an den Kanälen herumstellt.
    Der Techniker hat mein Adapter-Konstrukt dann entfernt und versucht, selbst ein Signal drauf zu bekommen, es kam aber das selbe Ergebnis. Daraufhin sagte er, dass die Zeilensynchronisation "gekippt" sei, womit ich als Laie natürlich wenig anfangen kann. Warum er dafür eine Schaltskizze haben will, ist mir auch nicht ganz klar.

    Soweit die Ausgangslage, ich hoffe ich muss das Gerät nicht zum Deko-objekt degradieren.

    Gruß,
    Sarah

    ReplyDelete
  6. Sarah,

    Ja alles gut aber das "ding" funktioniert nicht richtig oder ?

    Est ist besser im english schreiben, da die ganze welt hier liest.

    OK, Sarah,
    First Try to do some photograph of the screen when the telly is running with a picture on it.
    Then upload it to Imageshack.us
    after that , post here the links with the files, will give a look at them soon.

    (Be aware that photographing running tellyes isn't easy at all, so please do your best regarding this. Remote diagnosing isn't easy ! ! ! )

    Anyway i'm thinking that the video source that you're using isn't liked by the telly which is requiring a standard CCIR PAL signal to work properly and better if tuned in UHF band instead of the VHF band.

    Why you don't try to input a RF signal from a VHS VCR in the same way you did from the laptop, just to test something a different signal source.

    FRANK.

    ReplyDelete
  7. Hi Frank,

    I will do this once I get the tellye back from the technician, in case he can't fix it (I can't tell how likely this is). Right now he has the TV so I can't take a photo of it now.
    Usually I only collect audio devices (turntables, amps and such) and this is the first vintage TV I got.
    Anyhow, I will let you know as soon as I have any news about this.

    Have a nice day,
    Sarah

    ReplyDelete
  8. Hi Frank,

    I got the telly back today and it works. Here are some pictures and the result of the whole project:
    http://twenty-flight-rock.co.uk/2011/12/08/new-and-running-voxson-1202/

    Nevertheless I thank you for the patience you had for me!

    Cheers,
    Sarah

    ReplyDelete
  9. Glad you get it running OK !

    Smart persons like you are getting always successful things !

    FRANK.

    ReplyDelete

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