those flakes in your 866s are mecury. if they haven't been run in a while
you should let them sit with just the filaments on for a while, to make sure
the stuff gets where it needs to be. They look nice, but the mercury vapor
rectifiers need to be treated well especially after a long idle period. You
can direct sub a 3B28 argon rectifier tube, and not have to worry about the
866s. They don't glow as much, but are more tolerant tubes.
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