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This is the new and better version of the 12AT7 from Electro Harmonix. This new 12AT7 valve design has short plates to help reduce microphonics and noise. The 12AT7 valve type is equivalent to the European ECC81 valve and can be used in any 12AT7 or ECC81 circuit. The 12AT7WC-EH valve from Electro-Harmonix is ideal for phase inverters and reverb controllers.