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(Best SIngle) 6AW8A Sylvania NOS 1970's (3.9/23ma)
(SIngle) 6AW8A Raytheon coated glass NOS 1957 (3.8/15ma)
6AW8A Sylvania NOS 1960's (4.5/19ma)
6AW8A Sylvania NOS 1960's with special silver oxide coating (2.4/21.5ma)
6AW8A Sylvania NOS 1960's with special silver oxide coating (2.8/28ma)