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(!!!!!) (Best Sylvania Pair) 6L6GC Sylvania TALL BOTTLE NOS 1970's (79ma and 80ma) 1-3% matched
(!!!!) (Recommended Pair) 6L6GC Sylvania NOS 1960's - 1970 (63ma and 65ma)
(!!) (Best Single) 7N7 Sylvania branded Philco NOS parallel black plates 1940's (7.5/7.9ma)
(!!) 7N7 Sylvania branded Philco used/good short bottle parallel gray plates 1948 (7.2/7.6ma)
(!) (Best Single) 7N7 Sylvania NOS 1960 era (10.8/11.2ma)
(!) (Good Single) 7N7 Sylvania branded GE NOS 1961-1962 (7.5/8.3ma)
6L6GC Sylvania clear top NOS 1960's copper grid posts (68ma)
