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Old production General Electric "narrow plate" 12AT7 (left) and current production "long plate" Electro-Harmonix 12AT7 (right)
12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature nine-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. (Radio Frequency) devices operating up to VHF frequencies.[1]
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[update] the 12AT7 was manufactured in Russia (Electro-Harmonix brand), Slovakia (JJ Electronic), and China.
^Tung-sol data sheets for EC92 and 12AT7/ECC81 dated January 1969 and January 1952 respectively
12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature nine-pin medium-gain (60) dual-triode vacuum tube popular...
an emergency or for different performance characteristics, include the 12AT7, 12AU7, 12AV7, 12AY7, and the low-voltage 12U7, plus many four-digit EIA...
described as a "special quality" device. This contrasts with the 6AB4/EC92 and 12AT7/ECC81 which are both R.F. devices operating up to VHF. Double triodes of...
Slant 6V, which offers 6L6 or 6V6 power tube options also has 12AX7 and 12AT7 tubes, was praised as "an amazingly useful and versatile amp" and was a...
clone of the Fender AB763 circuit, it uses two 6L6GC power tubes and one 12AT7 Phase Inverter. The amplifiers have two channels, clean and Overdrive, switchable...
second 7025 being used for the reverb recovery and mixing stages. The single 12AT7 was used for the reverb driver while the 12AX7 was used for the vibrato...
The unit features three controls: Dwell, Mixer and Tone and includes a 12AT7 tube as a preamplifier; a 6K6 tube as the reverb driver; and a 12AX7 as...
pre-amps appear to be the product of a cottage hifi industry). 6N1P 6N2P 12AT7 6N3P tube datasheet 2C51 tube data (NJ7P Tube Database) DIY-Hybrid-Amplifier...
the '68 Custom Princeton Reverb. Preamp tubes: one 7025, two 12AX7, one 12AT7 Output tubes: two 6V6GT, fixed-bias Rectifier: 5AR4 (blackface & reissue)...
characteristics. Similar, but not identical, tubes are the 12AD7, 12AE7...12AT7, 12AU7, 12AV7, 12AW7 (rare), 12AY7, and the 12AZ7. A system widely used...
can be produced by this device. Some VST effects emulate this tube. The 12AT7 high-mu dual triode was designed primarily for RF mixing applications where...
Super Champ utilized 1× 12AX7 for the first and second stage preamp, a 1× 12AT7 for spring reverb driver tube, whilst the three sections of the triple-triode...
Russia and by JJ Electronic, and are widely available. List of vacuum tubes 12AT7 12AU7 12AX7 "6SN7W at the National Valve Museum". "6F8G". Retrieved 10 June...
They use six preamp tubes, consisting of four 7025/12AX7 types and two 12AT7 types. All Twin Reverbs feature a solid-state rectifier. The Fender Twin...
7025/12AX7 tubes for preamplification and tremolo oscillation, and two 6201/12AT7 tubes driving the reverb and phase inverter circuits. Throughout its production...
channel and the tremolo/vibrato oscillator/modulator circuits, one ECC81 (12AT7) phase inverter, and EL84 tubes in the power amplifier circuit. This first...
two identical sections in one envelope are used, usually the noval types 12AT7, 12AU7, or 12AX7 or equivalents, less usually the octal 6SN7. The earliest...
include: 6AG11 double diode similar to 6AL5, double triode high-mu similar to 12AT7. Designed for FM stereo multiplex service. 6BK11 triple triode. Two of the...
"Vibrato" channels, as well as to the oscillator for the tremolo effect, a 12AT7 tube as a phase inverter, and individual Treble and Bass control knobs rather...
EIMAC division of Varian. 1966-05-15 [1962]. Retrieved 2021-08-23. "12AT7* (label "12AT7" prefixes all tubes of this generic type)". The Datasheet Archive...
display amplitudes as low as 0.1 [inch] The KG-635 sync amplifier used a 12AT7 differential amplifier (V5). (id p. 15.) Sync level control would bias the...
distribute their new line of Dutch-made miniature tubes, (12AX7, 12AU7, 12AT7) to feed the booming U.S. hi-fi market. Classic hi-fi brands such as Marantz...
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