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12AT7 British Military designation(CV4024)vacuum tube, electron tube, valve. Same as ECC81. No need to talk about Mullard quality. We test for noise and micro phonics and match into pairs on 2 tubes or more. This lot is supplied as RTC(Radiotechnique branded) tubes, but it is the identical tube to the Mullard and was made by Mullard.ULTRA PREMIUM CRYO TREATED GRADE!