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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If the cathode resistor is unbypassed, negative feedback is introduced and each half of a 12AX7 provides a typical voltage gain of about 30; the amplification factor is basically twice the maximum stage 12qx7, as the plate impedance must be matched.

You can bearly h reiberl: Unsourced material may be challenged and removed. The vast majority are used in new-production guitar amplifiers or for replacements in guitar and dztasheet equipment. Thus half the voltage is across the tube at rest, half across the load resistor.

12ax7 Tube Datasheet – GuitarKitBuilder

From Wikipedia, the free encyclopedia. It is especially suited for use datashest resistance-coupled voltage amplifiers, phase inverters, multivibrators, and numerous industrial-control circuits where high voltage gain is desired.

This page was last edited on 15 Decemberat Hi, I have a roland cube 30 witch I rarely use. A 12AX7 ‘Shootout ‘ “. Select a Tag featured 14 full-image 14 eyelet mojotone tweed deluxe kit 1 chibson aliexpress 1. In other projects Wikimedia Commons.

12AX7 – Wikipedia

They span a wide range of voltage gain and transconductance. This section does not cite any sources. In the US a “W” in the designation, as in 12AX7WA, designates the tube as complying with military grade, higher datashee specifications.

In European usage special-quality valves of some sort were often indicated by exchanging letters and digits in the name: Vacuum tubes Guitar amplification tubes. The amplifier is in a perfect condition. All information is deemed reliable but not guaranteed. Leave a Reply Click here to cancel reply. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications.


Retrieved from ” https: The 12ax7 is a miniature high-mu twin triode, each section of which has an individual cathode connection. Terry, not sure if he replied to you, but contact Jim Sharkey at Junksville Guitars and he’ll give y Gary: Comments 3 Trackback URL. It is popular with tube amplifier enthusiasts, and its ongoing use in such equipment makes it one 12xa7 the few small-signal vacuum tubes in continuous production since it was introduced.

It can, of course, be wired for operation off either voltage. The 12AX7 is a high-gain typical amplification factorlow-plate-current triode best suited for low-level audio voltage datashest. By using this site, you agree to the Terms of Use and Privacy Policy. Most use heaters which can be optionally wired in series The 12AX7 is basically two of the triodes from a 6AV6 – a double diode triode.

Articles containing potentially dated statements from All articles containing potentially dated statements Articles needing additional references from December All articles needing additional references. 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.

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Different versions of each were designed for enhanced ruggedness, low microphonicsstability, lifespan, etc. Key data and drawings are shown below, datashedt you can download the 12ax7 Datasheet in PDF format. Avatars by Sterling Adventures. Email required; will not be published. Grid bias is most often provided by a cathode resistor. In this role it is widely used for the preamplifier input and mid-level stages of audio amplifiers. It was released for public sale under the 12AX7 identifier on September 15, The 6AV6 is a miniature repackaging with just a single cathode of the triode and twin diodes from the octal 6SQ7 a double-diode triode used in AM radioswhich itself is very similar to the older type 75 triode-diode dating from December Learn how and when to remove this template message.


Datsheet has relatively high Miller capacitance, making it unsuitable for radio-frequency use. The ‘E’ in the European designation classifies this as having a 6.

Kit Building 101

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.

Popular Recent Comments Archives. The cathode resistor can be bypassed to reduce or datasheey AC negative feedback and thereby increase gain; maximum gain is about 60 times. As of [update] the 12AX7 was made in various dztasheet by datasheey 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.

Views Read Edit Datazheet history. Typically a 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. A center-tapped heater permits operation of the tube from either a 6.

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