(!!!!) (Pair) 8D8=EF86 Brimar UK quad mica NOS 1961 (2.7ma and 2.6ma) 1-2% matched1 pair) 8D8=EF86 Brimar UK quad mica NOS 1961 in white boxes (4 mica supports) 1 tube) 2. 7ma Gm=1600 1 tube) 2. 6ma Gm=1600 Tested on Amplitrex Vplate=250V Vscreen=140V Vgrid= 2V Good Ma = 3ma Good Gm=1800 2200 Recommended for Vox AC10, AC30 Dr. Z Z 28 Vox AC15HTVH head (install all Mullard tubes: EF86, 12AX7, EZ81, EL84) Eastern Electric M520 Matchless C 30, SC30 Bottlehead VOX AC30 Heritage Microtek UM92. 1 mic [ MEYER SOUND LABS (Berkeley, CA) ]