Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
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The P7 phosphor is the one with the long decay time. I once bought a "test" tube from Olson Electronics (remember them?) with a P7 phosphor. It worked great and didn't need an ion trap.
Hybrid Mode
