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Ongoing efforts to rebuild 15GP22s all involve using mostly re-claimed parts from existing tubes. Simply stated, the parts to build clone tubes no longer exist and would be very expensive to re-tool to build. Take for example the glass frontpanel and funnel, it would cost hundreds of thousands of dollars to replicate the special molds that originally produced these parts, and then you would have to get a glass company to agree to make the parts. Same is true for electron gun parts and rodding fixtures to assemble them into carefully aligned guns. Stem pins and molding fixtures to make the 20 pin base feedthrough, big dollars, as well. Phosphor deposition fixtures would also be expensive. Like Bob G. said, start up costs to produce these could run into the millions of dollars.
jr
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