Pinched Tip
- Code On Tube
- 1593 E3, 1593 F3, 1593 E3, 1593 F3
- Country
- Great Britain
- Factory Code
- B - Mullard, Blackburn, B - Mullard, Blackburn
- Getter
- Square Getter
- Getter Support
- Double
- Glass Color
- Clear Glass
- Mica
- Double
- Other Marks
- Vertical Code
- Permanentid
- 1qq81xrz
- Pin Color
- Silver Pins
- Plate Color
- Matte Gray
- Plate Look
- Ribbed / Scale
- Plate Size
- 17mm
- Special Use
- KB - UK Military
- Tip Shape
- Pinched Tip
- Year
- 1953
