Round Tip
- Base
- Black
- Bottle Height
- Tall Bottle
- Bottle Shape
- Coke Bottle
- Code On Tube
- R73 B4C2
- Country
- Great Britain
- Factory Code
- B - Mullard, Blackburn, B - Mullard, Blackburn
- Getter
- Bottom Getter
- Glass Color
- Clear Glass
- Mica
- Double
- Other Marks
- Is marked Made in Holland, but etched code on tube points to Blackburn Mullard factory., Is marked Made in Holland, but etched code on tube points to Blackburn Mullard factory.
- Permanentid
- 1jj0taai18
- Pin Color
- Silver Pins
- Plate Color
- Matte Gray
- Tip Shape
- Round Tip
- Year
- 1964
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Branded Telefunken
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Branded Sel Lorenz
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Branded Miniwatt
