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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.
Mullard Limited was a British manufacturer of electronic components. The Mullard Radio Valve Co. Ltd. of Southfields , London, was founded in 1920 by Captain Stanley R. Mullard , who had previously designed thermionic valves (US term: vacuum tube) for the Admiralty before becoming managing director of the Z Electric Lamp Co. [ 2 ] The company ...
Older Mullard tubes were mostly designated PM, followed by a number containing the filament voltage. Many later tubes were designated one to three semi-intuitive letters, followed by a number containing the heater voltage. This was phased out after 1934 when Mullard adopted the Mullard–Philips scheme. Examples: [20]
President-elect Donald Trump is poised to seize greater control of the federal government than any modern president before him when he takes office on Monday, charging ahead with plans to ...
The most fun is an annual rich life review. This is a perfect time of the year to do it. You sit down with your partner and start by sending each other 20 of your most memorable photos from the year.