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If those are quiet and test high... what a find! I just gave up on finding any good ones. Even those $500 NOS matched pairs on EBay are a big risk. I use GE 7581A for most KT-66 amps these days. And they are getting ridiculously $$$. Esp those brown-tan based ones.

tremolux with GE 6L6GC-STR (7581A) photo tubes in_zpse4hwptux-1.jpg

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