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Truly ! A Once In A Lifetime Find KT88's From 1956 & 57

Posted by Interstage Tranny on February 18, 2017 at 17:15:30:
Wow ! Beautiful. Heirlooms for certain.

They "don't make them like this any longer." They probably became "straight sided" bulbous glass in 1958. There is no doubt that these were either inspired by 6550s or 6550s were inspired by these. IIRC, 6550s appeared in 1954 or 1955...