This is the Philips brand USA made Joint Army Navy (JAN) MIL-Spec version of the 12AT7 tube type. JAN tubes are unused surplus from US military stock, made to the exacting standards of the US military.
The JAN Philips 12AT7WC/ECC81 tube is a high quality military preamp tube that is preferred for guitar amps and high end audio. The JAN Philips 12AT7WC is durable, reliable, and provides great bang for the buck value.
The 12AT7 tube type is equivalent to the European ECC81 tube and can be used to replace any 12AT7 or ECC81 circuit. These are commonly used as phase splitter tubes or reverb drivers.
$40.00
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