Many tubes that are intended for special applications, industrial, or military use do not use the RETMA standard. These tubes have a four digit number as the designation. The format is CV followed by up to 5 digits. This system was used by the British military to codify vacuum tubes, gas tubes, and some semiconductors.

What do the numbers and letters mean on a vacuum tube?

1. What do the numbers and letters in a tubes 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 do tube numbers mean?

The first number is the diameter of your wheel. Sizes such as 26, 24, 20, 27.5, 29 and 700c are common tire diameters. The second number (after the X) is the width of your tire. For example, a 26 x 1.75 size means the tire diameter is 26 inches and the tire width is 1.75 inches.

What does Nos mean in vacuum tubes?

New Old Stock NOS stands for New Old Stock, which means that the tube has never been used and is from old production. In most vacuum tube circles NOS generally implies that the tube is in the original box. NIB stands for New In Box.

What do valve numbers mean?

If two or more letters follow the first letter, the valve contains more than one section in a single envelope (e.g. the ECH35 is a triode hexode). The first digit of the number following the letters shows the type of base but the second digit is merely a sequential number which is given to distinguish between valves.

What are the different types of vacuum tubes?

Different Types Of Vacuum TubesDiode Vacuum Tubes. One of the simplest forms of vacuum tubes is the diode. Triode Vacuum Tubes. Tetrode Vacuum Tubes. Pentode Vacuum Tubes.

Is the inner tube the same size as the tyre?

The size is almost always written somewhere on the sidewall of the tyre. Inner tubes typically state a wheel diameter and width range for which they will work, e.g. 26 x 1.95-2.125, indicating that the tube is intended to fit a 26 inch tyre with a width of between 1.95 inches and 2.125 inches.

How do I know my inner tube size?

The best way to check what size inner tube you need is to look on the sidewall of your tyre. Tyre manufacturers print the size on the sidewalls, so look out for numbers such as 700x23c for a road bike, or 26x1.

Are vacuum tubes interchangeable?

Substitute vacuum tubes are not exactly the same electronically but will perform the same in most circuits. We will not ship a substitute tube without first checking to see the application it is to be used in.

What number should your radiator be on?

As a rule of thumb most guidelines recommend heating your home to 70F (21C) and bedroom temperatures should be kept a little cooler to around 64F (18C). For most people this temperature will be comfortable, but if it feels a little hot (or alternatively cold) then the temperature can be adjusted from this baseline.

What are the 2 valves on a radiator?

One valve accounts for the amount of hot water that enters the radiator. The other valve, referred to as the lockshield valve, balances the system by regulating how much heat the radiator gives off.

Are vacuum tubes still used today?

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 are vacuum tube used for?

Electron tube, also called vacuum tube, device usually consisting of a sealed glass or metal-ceramic enclosure that is used in electronic circuitry to control a flow of electrons.

Can I use the wrong size inner tube?

No, tubes and tires dont need to match exactly. Tubes are made from butyl rubber which can stretch. Bike inner tubes will accommodate a limited range of sizes. Larger tubes may be more susceptible to getting pinched between the tire and rim.

How do I know what inner tube to buy?

The best way to check what size inner tube you need is to look on the sidewall of your tyre. Tyre manufacturers print the size on the sidewalls, so look out for numbers such as 700x23c for a road bike, or 26x1. 75 which is for mountain bikes.

Is 28 inch the same as 700C?

The tyres can differ, but the 28”, 700C and 29er are all the exact same rim diameter. The 700 markings will be followed by the width in mm, and the 28 or 29 markings will be followed by the width in inches. This is the most common wheel size, so look out for familiar markings (such as 28x1.