This is what I found.
CBRZ = "(Philco Plant in Manaus [Brazil]; electronic tubes made by Lansdale Philco plant for US Army)"
Edit, It seem that Lansdale also had the PA former N-U factory.
More, "Collection of Philco Experimental Tubes
Featured on this page are some selected items from a collection of experimental and developmental tubes that were acquired from the estate of an engineer who had worked for the Philco Corporation. They were produced at the former National Union plant in Lansdale, Pennsylvania, which Philco bought in 1947."
So the Lansdale Tube Co. is Philco but I don't think the JAN code CBRZ, C for contractor and BRZ for Brazil, would have been used on a tube made in the USA but I don't know for sure. I can't find any definitive info.
Tre'
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"Still Working the Problem"
Edits: 07/10/12 07/10/12
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