The JAN Philips 12AT7WC / ECC81 tube is a high quality military pre-amp tube that is preferred for guitar amps and high end audio. The JAN Philips 12AT7-WC 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 in any 12AT7 or ECC81 circuit.