1 matched quad) 8D8=EF86 Brimar UK quad mica NOS 1961 in white boxes

1 tube) 2.8ma Gm=1900

1 tube) 3.0ma Gm=1800

1 tube) 3.0ma Gm=1800

1 tube) 3.0ma Gm=1900

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) ]
- U67
- Luxman MQ-68C