ECC83=12AX7 Mullard UK BVA long plates “”O”” getter like new 1958 (f91 series) (1.2/1.2ma)

1 low noise tube) ECC83=12AX7 Mullard UK BVA long plates “”O”” getter like new

(f91-B8E=1958) in white box – good “”upside down”” printing

1 section) 1.2ma Gm=1500

1 section) 1.2ma Gm=1500

• (f91-B8E=1958) (f91 series, 2nd series)
• 17mm = long plates
• “”O”” getter halo
• copper grid posts
• big midrange, sweet high end, very rare