- Country
- Great Britain
- Factory Code
- B - Mullard, Blackburn, B - Mullard, Blackburn, B - Mullard, Blackburn
- Getter Support
- One
- Glass Color
- Clear Glass
- Mica
- Double
- Permanentid
- v33b4hqe
- Pin Color
- Silver Pins
- Plate Color
- Matte Gray
- Tip Shape
- Pinched Tip
- Year
- 1964
