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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The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications. You can bearly h reiberl: Most use heaters which can be optionally wired in series Thus half the voltage is across the tube at rest, half across the load resistor. The cathode resistor can be bypassed to reduce or eliminate AC negative feedback and thereby increase gain; 12×7 gain is about 60 times.

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Views Read Edit View history. In the US a “W” in the designation, as in 12AX7WA, designates the tube as complying with military grade, higher reliability specifications. 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 In this role it is widely used for the preamplifier input and mid-level stages of audio amplifiers. A center-tapped heater permits operation of the tube from either a 6.


The 12ax7 is a miniature high-mu twin triode, each section of which has an individual cathode connection.

12AX7 (GEC) – Twin Triode | eet

If the cathode resistor ratasheet 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.

They span a wide range of voltage gain and transconductance. Unsourced material may be challenged and removed. Grid bias is most often provided by a cathode resistor.

The ‘E’ in the European designation classifies this as having a 6. It has relatively high Miller capacitance, dtasheet it unsuitable for radio-frequency use. Terry, not sure if he replied to you, but contact Jim Sharkey at Junksville Guitars and he’ll give y Gary: 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.

Retrieved from ” https: A 12AX7 ‘Shootout ‘ “. This section does not cite any sources. It was released for public sale under datashset 12AX7 identifier on September 15, How do I go about purchasing the Grizzly H guitar kit giorgos: Subscribe If you enjoyed this article, subscribe to receive more just like it.

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. By using this site, you agree to the Terms of Use and Privacy Policy.


The vast majority are used in new-production guitar amplifiers or for replacements in guitar and audio equipment. Leave a Reply Click here to cancel reply. Comments 3 Trackback URL. Email required; will not be published.

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

The amplifier is in a perfect condition.

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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. Datahseet other projects Wikimedia Commons.