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(!!) (Single) 12AT7 Brimar Zaerix square black plates triple mica large "O" getter halo like new 1957 (9.2/7.0ma)
(!!) (Single) 6060=12AT7 Brimar Thorn UK square black plates triple mica large "O" getter halo 1960 NOS (6.4/8.4ma) (Premium low noise 12AT7)
