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
We appreciate your help
in keeping this site going.
OK, so just a standard warning. I was thrown because it seemed to be specific to the tube 21SFA. Which doesn't cross to a CRT that I could find. I will continue to be careful!
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