0G3
The OG3 (European equivalent 85A2) is an 85 V voltage reference tube with a miniature B7G 7-pin base.
![](http://w140.com/tekwiki/images/thumb/a/a6/Tube_OG3.jpg/300px-Tube_OG3.jpg)
Pictures
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OG3 inside a 547
The OG3 (European equivalent 85A2) is an 85 V voltage reference tube with a miniature B7G 7-pin base.
OG3 inside a 547