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RE: Out of curiosity

Posted by Mendel on January 28, 2011 at 14:00:26:
Ha--learn something new every day. It appears they are not a perfect pair. One (B8J) has the staple with a small white wire running from it. The other has a slightly raised section on the top mica--no wires. Both actually have halo getter's supported by a "bridge" getter holder that cuts across the circle getter, making it look like a D getter. Wait--I found another one. This one has the Mullard shield logo code B7A--the same long grey plates and a bent square getter with "bridge" double getter holder.
Given that they are not a perfect pair my judgement of these tubes may be harsh (but I doubt it). Hopefully soon I will find a match to one of these three a try them again.