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Help identifying these EL34s??


Silver Supporting Member
I recently received my two Marantz Model 9 monoblock power amps back from my tech, and he installed all new Svetlana Winged C EL34s in the amps. He pulled out these Philiips 6CA7s, five of which had lost their vacuum. These three tubes appear to be ok, but I didn't get them tested. They have double O getters; i can't seem to locate any manufacturing code on them.

Could anyone tell me specifically where these came from and when they were made? Thanks!



low rent hobbyist
Sylvania "Big Bottle" 6CA7's. Made in the USA

They look well used from the brownish coloring of the getter flash

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