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A vacuum tube is an electronic device that is used to amplify or alter a signal by controlling the way electrons move or travel in a vacuum.

There are literally thousands of different kinds of vacuum tube types, but the information here will will focus primarily on those vacuum tube types which are used for audio applications like hifi stereos and guitar amplifiers.

12AX7 is a vacuum tube of high gain. It is believed to have been originally developed in 1946 by RCA. The 12AX7 vacuum tube was originally intended as miniature form-factor follow-on to the 6SN7 vacuum tube family of dual-triode low-cost amplifier tubes for audio and computer applications. Its wide use as a vacuum tube in tube based guitar amplifiers has caused it to be one of the very few small-signal type of vacuum tube to continue in production since it was introduced. The 12AX7 is the most common member of a huge family of miniature twin-triode type of vacuum tube types.

The vacuum tube has a center tapped filament so it can be used in either 6.3V 300ma or 12.6V 150ma heater circuits.

Presently the 12AX7 vacuum tube is made in various versions in Russia, China, and Slovokia and one in Serbia, for a total annual production figure of 2 million units (estimated). The vast majority of these types of vacuum tube are used in new-production guitar amplifiers or for replacement purposes in guitar or audio equipment. However, in our opinion, these new production types of 12AX7 vacuum tube do not even come close to the tonal qualitites of NOS (New Old Stock) type of vacuum tube produced in the USA, Great Britian, Holland, and Germany. If you would like to check out the NOS 12AX7 vacuum tube offerings we have then please Click Here!