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|GEC copy by VALVE ART w/ brown base made in China.CRYOGENICALLY TREATED MATCHED PAIRS. Great in Marshall BB, Fender and other amps where a 6L6 applications is specified. We test and match into pairs or quads as per your request. Tubes are offered as matched prs. when putting quantity (1) in cart. Note that this manufacturer has been making the KT66 longer than anyone, and we know they are the best available.