ID:
2489
Maker's Name:
Osram B.V.A.
Where made:
England
c. 1930
Dimensions:
4.6 × 4.6 × 14 cm
These radio receiver valves have glass tubes sheathed in ventilated steel cages.
1. Unknown with B7 base
2. VMS4CP with B5 base
3. MS4R with B5 base
2489 - Catkin Valves (c. 1930)
