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Now that I know what they are...

Posted by 1973shovel on August 26, 2021 at 16:48:17:
I'm finding posts about them like the one linked below, from fourteen years ago where Jim McShane said:

"I've also seen them[6106]labeled 5AR4, believe it or not!"

Given the 6106 aviation rating, it's nice to know that if I ever get an amp which uses them, my rectifier will be good to 80,000 feet.

Thanks again.