2 Haltron type 42. Made by Brimar in England in the 50s. They test strong and as a perfect matched pair at 40.0 and 40.0mA where 34.0mA is the nominal. I have two pair of these tubes listed. This is pair no1.
"Pease see my other premium 6SN7 tubes". Triode 1 : 82% Emis 96% GM.
Brimar BVA. This tube is a 12AT7 Brimar 12AT7 preamp tube. Matte black ribbed wing plates angled square getter. this Tube was tested on the Jackson model 103 where a typical NOS Tube will have a test result of around 38-40 and the minimum good value is 25.
Model: RCA / GE / Raytheon / Sylvania / Various. Visible tube types include, among others The complete lot is solduntested. Custom Bundle: Yes. Type: Vacuum Tube. Mixed lot: many tubes appear NOS/NIB, others are used.