12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature 9-pin medium-gain (60) dual-triode vacuum tube popular in guitar amplifiers. It belongs to a large family of dual triode vacuum tubes which share the same pinout (EIA 9A), including in particular the very commonly used low-mu 12AU7 and high-mu 12AX7. The 12AT7 has somewhat lower voltage gain than the 12AX7, but higher transconductance and plate current, which makes it suitable for high frequency applications.
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| - 12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature 9-pin medium-gain (60) dual-triode vacuum tube popular in guitar amplifiers. It belongs to a large family of dual triode vacuum tubes which share the same pinout (EIA 9A), including in particular the very commonly used low-mu 12AU7 and high-mu 12AX7. The 12AT7 has somewhat lower voltage gain than the 12AX7, but higher transconductance and plate current, which makes it suitable for high frequency applications. (en)
- 12AT7 (también conocido en Europa por la designación de Mullard-Philips ECC81) es una válvula con dos triodos con ganancia media (60) y una distribución de 9 patas, frecuentemente utilizada en amplificadores de guitarra . Pertenece a una familia de triodos dobles que comparten las mismas patas (EIA 9A), junto a las válvulas 12AU7 de bajo mu y la 12AX7 de alto mu. . La 12AT7 tiene una ganancia de voltaje algo menor que el 12AX7, pero mayor transconductancia y corriente de placa, lo que lo hace adecuado para aplicaciones de alta frecuencia. (es)
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| - 12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature 9-pin medium-gain (60) dual-triode vacuum tube popular in guitar amplifiers. It belongs to a large family of dual triode vacuum tubes which share the same pinout (EIA 9A), including in particular the very commonly used low-mu 12AU7 and high-mu 12AX7. The 12AT7 has somewhat lower voltage gain than the 12AX7, but higher transconductance and plate current, which makes it suitable for high frequency applications. Originally the tube was intended for operation in VHF circuits, such as TV sets and FM tuners, as an oscillator/frequency converter, but it also found wide use in audio as a driver and phase-inverter in vacuum tube push–pull amplifier circuits. This tube is essentially two 6AB4/EC92s in a single envelope. Unlike the situation with the 6C4 and 12AU7, both the 6AB4 and the 12AT7 are described by manufacturer's data sheets as R.F. devices operating up to VHF frequencies. The tube has a center-tapped filament so it can be used in either 6.3V 300mA or 12.6V 150mA heater circuits. As of 2012 the 12AT7 was manufactured in Russia (Electro-Harmonix brand), Slovakia (JJ Electronic), and China. (en)
- 12AT7 (también conocido en Europa por la designación de Mullard-Philips ECC81) es una válvula con dos triodos con ganancia media (60) y una distribución de 9 patas, frecuentemente utilizada en amplificadores de guitarra . Pertenece a una familia de triodos dobles que comparten las mismas patas (EIA 9A), junto a las válvulas 12AU7 de bajo mu y la 12AX7 de alto mu. . La 12AT7 tiene una ganancia de voltaje algo menor que el 12AX7, pero mayor transconductancia y corriente de placa, lo que lo hace adecuado para aplicaciones de alta frecuencia. Originalmente el tubo estuvo diseñado para operación en VHF circuitos, como conjuntos de televisión y sintonizadores de FM, en convertidores de frecuencia y osciladores, y también utilizada en aplicaciones de audio como driver e inversor de fase en circuitos push-pull en amplificadores. Esta válvula consiste esencialmente en dos 6AB4s o dos EC92s en un solo tubo. El tubo tiene un filamento de derivación central, por lo que puede usarse en circuitos de calefacción de 6.3V 300mA o 12.6V 150mA. La 12AT7 hasta 2012 era fabricada aún en Rusia (Electro-Harmonix), Eslovaquia, y China. (es)
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