5651
![](http://w140.com/tekwiki/images/thumb/f/fd/Tube_5651.jpg/300px-Tube_5651.jpg)
The 5651 is an 87 V (at 3.5 mA) glow discharge voltage reference tube with a miniature B7G 7-pin base. It is very similar to the 0G3/85A2.
The 5651 is used in the power supply of the 128, 160, 310, 310A, 502, 503, 504, 512, 526, 536, 581, 585, 549, 535 and other instruments.
Tek part number: 154-0052-00
Links
Pictures
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5651 inside a 549