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.![](../pics/aaa1111a.jpg)
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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