How build a vacuum tube radio

What does a vacuum tube do for radio transmission?

The type known as a thermionic tube or thermionic valve uses the phenomenon of thermionic emission of electrons from a hot cathode and is used for a number of fundamental electronic functions such as signal amplification and current rectification.

Are vacuum tubes valuable?

Some older Western Electric tubes unused or the original box will sometimes sell for over a thousand dollars at auction. … Any early vacuum tube with a “tip” (the little glass nub on the top) and a brass base has some value to collectors even if it’s just usable for display.2 мая 2011 г.

Are vacuum tubes dangerous?

These types of tubes are readily discerned by a competent trained health physicist, and are not a significant radiation danger, but they are a factor of 10 to 200 times higher than normal background radiation.

What devices use vacuum tubes?

Vacuum tubes were also used in radios, televisions, radar equipment, and telephone systems during the first half of the 1900s. In the 1950s, the transistor started to replace the vacuum tube. As computing devices started to become smaller in size, transistors were more ideal to use due to their smaller size as well.

Do we still use vacuum tubes?

By this point most tubes had been replaced in the west. … These tubes were replaced by charge-coupled devices (CCDs). 1990s-Today – Vacuum tubes are still used today. Musicians still use tube amplifiers and claim they produce a different and desirable sound compared to solid state amplifiers.

What is the difference between vacuum tube and transistor?

Transistor and vacuum tube both are almost same in conceptually. Transistors are used in small integrated circuits which require low voltage supply and Vacuum tubes are used in high power applications. In the manner of size, the transistor is smaller than vacuum tubes. Vacuum tubes are really big and very hot.

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How long do vacuum tubes last?

about 5,000 to 10,000 hours

Why are vacuum tubes so expensive?

Tube amps are expensive because they adopt pre and power tubes as their primary amplification source. Each tube costs roughly $50 and can have up to 4 of them within a single unit. Secondly, these amps have more expensive components, larger cases, and more complex circuitry than solid-state amps.

How do you know if a vacuum tube is bad?

When a vacuum tube develops an air leak (a small crack or bad seal by a pin for example) this getter color will change to pure white. If you see this you know with 100% certainty that the tube is bad. Third, look for a purple glow that is very focused around specific elements inside the tube.

What was the main disadvantage of vacuum tubes?

Vacuum Tubes: Disadvantages

High power consumption; needs heater supply that generates waste heat and yields lower efficiency, notably for small-signal circuits. Glass tubes are fragile, compared to metal transistors. Sometimes more prone to microphonics than transistors, depending upon circuit and device.

Can vacuum tubes explode?

… “the oily residue from your skin will get on the vacuum tubes. Then when they heat up it can cause them to explode- just like halogen light bulbs.”

How do you dispose of vacuum tubes?

Contact the Global Electronics Recycling Network. This group maintains a network of electronic recycling organizations in many countries. Use its website to locate an electronics recycling organization near your home; you can find out the drop-off location and the cost of disposing of your vacuum tubes.

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What are the advantages of vacuum tubes?

Some advantages of vacuum tubes include:

  • Ability to withstand damage caused by an electromagnetic pulse, which occur during a nuclear explosion.
  • Ability to operate at higher power, higher voltage, and higher operating temperature than solid state devices.
  • Unique tonal qualities that make it good for audio amplifiers.

24 мая 2011 г.

Why do vacuum tubes glow blue?

Sometimes you may notice a blue hazy glow inside your amp tube. This glow is rarely a sign of a defect and is fairly common especially in modern power tubes. This type of glow is called Fluorescence. This phenomenon is due to electron bombardment of the glass taking place within the tube.

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