(!!) (Best Overall Pair) 6FY5=EC97 Sylvania branded GE NOS 1974 same date codes (14.5ma and 14.8ma)

1 Pair) 6FY5=EC97 Sylvania branded GE NOS 1974 same date codes (NI)

1 tube) 14.5ma Gm=16,800

1 tube) 14.8ma Gm=17,100

– Wright Sound

NOS mA 10-12mA+

NOS Gm 13,000+