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7308 tube code question

I just received 10 NOS Amperex 7308 from my father. Each tube has the following markings:

All lettering in white
USN-CEP
A white triangle like symbol
VR5 *5B etched in the glass

The only nomenclature that I am familiar with is the USN = US Navy. What does the rest mean? What do people think of these tubes in a phono section of a pre-amp designed to take 6DJ8's
brf

Showing 2 responses by ed_sawyer

ed_sawyer
588 posts
 
nice score! (let me know if you want to part with any of those). they are US Navy Amperex, made in Holland, 1965 most likely. VR5 is the code for 7308s. the delta signifies made in holland. White is the earlier ink that Amperex used (generally). Should do well in a phono pre. Those are a low-noise variety of 6922.

-Ed
ed_sawyer
588 posts
 
In the case of the delta being in paint on the tube, that doesnt' signify holland manufacture. the * does mean US made, sorry I didnt' notice that in the orig. post. Tube codes such as * and delta are always etched on the amperex, near the bottom of the tube.

-Ed
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