Perhaps the number stands for the person who assembled it? Jens
On 7/18/2017 10:57 AM, Roddy Scott wrote:
I dismantled the prototype Tesla Meets Edison as it had served its
purpose as a test for the final clock and while removing the tubes I
noticed that they all had penciled numbers written on the rear of the
cathode casing.
Any clues as to why a mass produced item would have hand annotation on it?
The tubes in question are ITT GNP-7AH.
<https://lh3.googleusercontent.com/-Q00KN4waRW8/WW46nGCAYII/AAAAAAAABOk/DjQhuL70O_A8hJAID17AVwLdcLVJTKrHQCLcBGAs/s1600/GNP%2BMarkings.jpg>
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