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#7
10-20-2016, 10:29 PM
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Hmm, good point. I ran into that issue once when using a rebuilt tube that had the right electronic characteristics but a slightly different bulb profile than the original.
Most of the dimensions look close enough, but now I see that the diameter at the 12KP4A screen face is 7/16" wider than the 12JP4. Of course, the dimensions given in the data sheets are plus-or-minus some fraction of an inch. I'll investigate whether there's enough wiggle room to accommodate it. Phil Nelson Phil's Old Radios http://antiqueradio.org/index.html Last edited by Phil Nelson; 10-20-2016 at 10:33 PM. 
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