What do the numbers on a vacuum tube mean?

1. What do the numbers and letters in a tube’s name mean? There are several different tube numbering systems that you may see on tubes, which generally are a result of where they were built. Most commonly the numbers contain digits only (e.g. 5751), or are some combination of numbers and letters (12AX7, ECC83, CV4004).

What is the largest vacuum tube?

One Cold War tube that is still going strong is the huge ring-bar traveling-wave tube. This high-power tube stands over 3 meters from cathode to collector, making it the world’s largest TWT.

What is the oldest vacuum tube?

thermionic valve
1904: British engineer John Ambrose Fleming invents and patents the thermionic valve, the first vacuum tube. With this advance, the age of modern wireless electronics is born.

Which vacuum tubes are valuable?

Here is a shortlist of valuable vacuum tubes for collectors:

  • The 2A3 (from $50), 45 (from $25), 50 (from $200) are enjoyed explicitly by the audiophile crowd.
  • The 12AX7 preamp tube (from $10)
  • The American 6L6 tube (from $15)

What happens if a vacuum tube breaks?

Properly made vacuum tubes typically break from only one of two causes: a substantial impact or thermal shock. Due to the vacuum’s reverse pressure, GoSun’s cooking chambers actually implode if they break, they do not send projectiles of broken glass.

Can you still buy vacuum tubes?

Some brands still produce vacuum tubes, but its often possible to find new or used tube models made by brands that discontinued production years ago. Some examples of the brands that make these electronic components include Amperex, GE, Mullard, RCA, and Sylvania.

What is the drawback of vacuum tubes?

Vacuum Tubes: Disadvantages Bulky, hence less suitable for portable products. Higher operating voltages generally required. 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.

Is vacuum tube still use?

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.

Are old vacuum tubes worth money?

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.

How long does vacuum tube last?

The lifespan of a tube can be a bit tough to predict but the following may provide a bit of a guideline. If you play at moderate levels, 10-15 hours a week… Preamp Tubes are generally at their best 2 – 3 years. Power Tubes are generally at their best 1 – 1.5 years.

How do you know when a tube needs replacing?

A: These are the most common signs that tubes need replacement:

  1. Excessive noise (hiss, hum) including squealing or microphonic tubes.
  2. Loss of high end.
  3. A muddy bottom end; Sounds like there is too much bass and note clarity is lost.
  4. Erratic changes in the overall volume.
  5. The amp doesn’t work!

How old is the rohre 58 vacuum pentode?

Aug.1931 70 Years of Radiotubes and V. model RCA with this tube was late April 1932. 6-Pin-Base U6A, old, USA (Codex=Kf) Top contact with a cap.

What was the original purpose of the vacuum tube?

Originally, the only use for tubes in radio circuits was for rectification, not amplification. In 1906, Robert von Lieben filed for a patent for a cathode ray tube which included magnetic deflection. This could be used for amplifying audio signals and was intended for use in telephony equipment.

Where can I find a vacuum tube cross reference table?

[Vacuum Tube Cross Reference Table ]Analog Metric www.analogmetric.com 5 5Z4G 5Z4P 5Z4GT 5Z4P 6AE6 6Z18 6AF3 6Z18 6AG5 6J3 6AH6 6J5 6AJ8 6U1 6AK5 6J1 6AK5W 6J1 , 6J1-Q [Vacuum Tube Cross Reference Table ]Analog Metric www.analogmetric.com 6

What are the analog metrics of a vacuum tube?

1L34 2P2 1R5 1A2 2S/140G 6D6A-Q 2X2/879 2Z2P 2X3 2Z2P 3A4 2P3 4L20 4P1S 5U4 5Z3P 5U4G 5Z3P [Vacuum Tube Cross Reference Table ]Analog Metric