(!!!) (Single 1958) 12AX7=ECC83 Siemens Germany long plates "o" getter halo 1958 used/good (0.8/0.9ma and Gm=1400/1400)

1 low noise tube) 12AX7=ECC83 Siemens Germany long plates "o" getter halo 1958 used/good in white box - faded printing - made for Fisher NY

1 section) Gm=1400 (0.8ma)

1 section) Gm=1400 (0.9ma)

recommended for:

Manley Reference Cardioid Microphone REFCARD (Manley Ref C)