ID: 
1976
Maker's Name: 
unknown
Where made: 
Japan
circa 1929?
Dimensions: 
4.2 × 4.2 × 10.5 cm

Amplifying triode popularly used in USA Coffin radio receivers. It has a low gain, typical of the period. This particular valve was made in Japan for the Japanese navy, but resembles accurately the US valve.