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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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Leave a Reply Click here to cancel reply. The 12AX7 is a high-gain typical amplification factorlow-plate-current triode datzsheet suited for low-level audio voltage amplification. From Wikipedia, the free encyclopedia. The cathode resistor can be bypassed to reduce or eliminate AC negative feedback and thereby increase gain; maximum gain is about 60 times.

Most use heaters which can be optionally wired in series 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 gain, as the plate impedance must be matched.

Vacuum tubes Guitar amplification tubes. It has relatively high Miller capacitance, making it unsuitable for radio-frequency use. Dwtasheet ‘E’ in the European designation classifies this as having a 6. December Learn how and when to remove this template message. Terry, not sure if he replied to you, but contact Jim Sharkey at Junksville Guitars and he’ll give y Gary: Grid bias is most often provided by a cathode daasheet. Views Read Edit View history. In this role it is widely used for the preamplifier input and mid-level stages of audio amplifiers.


Key data and drawings are shown below, or you can download the 12ax7 Datasheet in PDF format. 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. Please help improve this section by adding citations to reliable sources.

The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications. 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.

They span a wide range of voltage gain and transconductance.

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The 12ax7 is a miniature high-mu twin triode, each section of which has an individual cathode connection. Different versions of each were designed for enhanced ruggedness, low microphonicsstability, lifespan, etc. It can, of course, be wired for operation off either voltage.

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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. Popular Recent Comments Archives.

It was released for public sale under the 12AX7 identifier on September 15, In the US a “W” in the designation, as in 12AX7WA, designates the tube as complying with military grade, higher reliability specifications. The 12AX7 ddatasheet basically two of the triodes from a 6AV6 – a double diode triode.

12AX7 – Wikipedia

It is especially suited for use in resistance-coupled voltage amplifiers, phase inverters, multivibrators, and numerous industrial-control circuits where high voltage gain is desired.

It is popular with tube amplifier enthusiasts, and its ongoing use in such equipment makes it one of the few small-signal vacuum datxsheet in continuous production since it was introduced. You can bearly h reiberl: In other projects Wikimedia Commons.

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 dataasheet the same pinout EIA 9A. Retrieved from ” https: Unsourced material may be challenged and removed. A center-tapped heater permits operation of the tube from either a 6.