12AX7. High-Mu Twin Triode. 9-PIN MINIATURE TYPE. GENERAL DATA. Electrical: Heater, for Unipotential Cathodes: Heater arrangement. Series Parallel . Resistance – coupled amplifer cathode grid bias. Limiting Values: Ua = V. Wa = 1 W. Ik = 8 mA. Ug = V. Rg = 2,2 MΩ. Uk/f = V. Rk/f = kΩ. 12AX7. 12AX7 Application Data. Class, Va, Vg1, Ia, Ra, S. Triode, , -1, , 80,, Triode, , -2, , 62,, 12AX7 Data sheet links.

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:: 12AX7 Vacuum Tube page

In European usage special-quality valves of datashet sort were often indicated by exchanging letters and digits in the name: The amplifier is in a perfect condition. In this role it is widely used for the preamplifier input and mid-level stages of audio amplifiers. December Learn how and when to remove this template message. The 12AX7 is a high-gain typical amplification factorlow-plate-current triode best suited for low-level audio voltage amplification.

The vast majority are used in new-production guitar amplifiers or for replacements in guitar and audio equipment.

This page was last edited on 15 Decemberat Popular Recent Comments Archives. Grid bias is most often provided by a cathode resistor. Hi, I have a roland cube 30 witch I rarely use.

The 12AX7 is the most common member of what eventually became a large family of twin-triode vacuum tubes, manufactured all over the world, all sharing the same pinout EIA 9A. Typically dahasheet 12AX7 triode is configured with a high-value plate resistor, k ohms in most guitar amps and k ohms or more in high-fidelity equipment.


Vacuum tubes Guitar amplification tubes. Thus half the voltage is across the tube at rest, half across the load resistor.

Kit Building 101

Key data and drawings are shown below, or you can download the 12ax7 Datasheet in PDF format. Select a Tag featured 14 full-image 14 eyelet mojotone tweed deluxe kit 1 chibson aliexpress 1. It is popular with tube amplifier enthusiasts, and its ongoing use in such equipment makes it one of the few small-signal vacuum tubes in continuous production since it was introduced. They span a wide range of voltage gain and transconductance.

Comments 3 Trackback URL. Avatars by Sterling Adventures. Please help improve this section by adding citations to reliable sources. This section does not cite any sources. The 12ax7 is a miniature high-mu twin triode, each section of which has an individual cathode connection.

12AX7 – Wikipedia

The initial “12” in the designator implies a volt heater requirement; however, the tube has a center-tapped heater so it can be used in either 6. All information is deemed reliable but not guaranteed.

By using this site, you agree to the Terms of Use and Privacy Policy. As of [update] the 12AX7 was made in various versions by two factories in Russia Winged C, formerly Svetlana, and New Sensorwhich produces tubes under the Sovtek, Electro-Harmonix, Svetlana, Tung-Soland other brands for which the firm has acquired trademark rightsone in China Shuguangand one in Slovakia JJ Electronicfor a total annual production estimated at two million units.


Most use heaters which can be optionally wired in series In the US a “W” in the designation, as in 12AX7WA, designates the tube as complying with military grade, higher reliability specifications. It has relatively high Miller capacitance, making it unsuitable for radio-frequency use. Unsourced material may be challenged and removed.

It was released for public sale under the 12AX7 identifier on September 15, Views Read Edit View history. Subscribe If you enjoyed this article, subscribe to receive more just like it. Articles containing potentially dated statements from All articles containing potentially dated statements Articles needing additional references from December All articles needing additional references.

122ax7 required; will not be published. A center-tapped heater permits operation of the tube from either a 6. The 12AX7 is basically two of the triodes from a 6AV6 – a double diode triode. The cathode resistor can be bypassed to reduce or eliminate AC negative feedback and thereby increase gain; maximum gain is about 60 times.