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No.12

 
    
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The No.12 is a mystery. The frosted glass says 170 Ohms and the resistance across pins four and five is 18 Ohms cold.
The wide glass tube envelope is 32 mm in diameter, and excluding the B7 base pins is 84 mm tall.
Reference: Observation.

 

Pin Connections
B7
1
2
3
4
5
6
7
-
-
-
w
w
-
-

 

Updated October 18, 2014.
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