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Unknown

 
See also:
The Dawn of Broadcasting in the UK
    
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This triode exhibit is a mystery. The sticker has the third BBC logo on it and this it dates from between 1924 and 1927. The anode is bright and rectangular in shape.
The rest of the sticker is unreadable. A 'Z' can be read.
The balloon envelope is 53 mm in diameter, and excluding the B4 base pins is 99 mm tall.
Reference: Observation.

 

Updated March 01, 2013.
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