Branded Sonotone
Pinched Tip
- Code On Tube
- xf2 B3
- Factory Code
- B - Mullard, Blackburn
- Getter
- O-O Double Getter
- Glass Color
- Clear Glass
- Mica
- Double
- Other Marks
- Marked as made in West Germany, but most probably made in Blackburn UK
- Permanentid
- q51250kj
- Pin Color
- Silver
- Plate Color
- Matte Gray
- Plate Look
- Weld
- Tip Shape
- Pinched Tip
