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VT-B

 
    
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Moorhead also made the type B class I soft tube to be used as a detector shown above. Marconi preferred to sell the hard VT-A tube they claimed was the best all-around tube for general radio use but amateurs really preferred the soft type B as it was much more sensitive.
The original box.
Taken from Joe's article.
Thanks to Joe Gruber for sending the images.
The balloon envelope is 44 mm in diameter and, excluding the UV base pins, is 104 mm tall.
Reference: Joe Gruber. Type VT-B was first introduced in 1917.

 

Pin Connections
UV
1
2
3
4
g1
f
f
a

 

Updated June 13, 2020.
shape:balloon construction:pinch type:triode age:pre.1920 base:uv pins:4 pin:1.g1 pin:2.f pin:3.f pin:4.a
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