ECC84=6CW7 Mullard Sonotone NOS 1960 (11.2/11.8ma) Title: ECC84 Mullard Sonotone

1 tube) ECC84=6CW7 Mullard UK Sonotone NOS (m91-B0B=1960) also printed 1962

1 section) 11,8ma Gm=6300

1 section) 11.2ma Gm=5900

Tested on Amplitrex

Vplate=90

Vgrid=-1.5

Good Ma 9-12ma

Good Gm 5000-6000