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12AX7 (also known as ECC83 [1]) is a miniature dual-triode vacuum tube with high voltage gain. Developed around 1946 by RCA engineers [ 2 ] in Camden, New Jersey , under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947.
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 .
[4] This contrasts with the 6AB4/EC92 and 12AT7/ECC81 which are both R.F. devices operating up to VHF. Double triodes of the 12AU7 family have a center-tapped filament for use in either 6.3V 300mA or 12.6V 150mA heater circuits. As of 2012 the 12AU7 continued to be manufactured in Russia, Slovakia (JJ Electronic), and China. Tronix 12AU7
The first two 7025 valves are used for the first stage pre-amps (one 'normal' channel and one 'vibrato'), the 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 circuit.
The following digicams include a 2 ⁄ 3-inch CCD sensor, a fixed lens with a maximum aperture of f / 2.4 or wider, and SD or CompactFlash (CF) memory card slots. However, none of them support SDHC/SDXC memory cards or AA/AAA batteries. Even larger CCD sensors were only included in interchangeable-lens cameras, such as the Canon 1D, Nikon D60 ...
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The Carr amplifiers with 6L6 tubes are compared to classic Fender amps; the 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 "Guitar Player Editors' Pick" in 2009. [3]
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