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Do It Yourself (DIY) paradise for tube and SET project builders.

I should probably stay out of this but....

...Eric Barbour discusses the ridges or "dams" in tube bases in his article on the 6550 and KT88 in issue #6 of Vacuum Tube Valley (winter, 1997). On page 22, column 3, paragraph 1 he states "Thanks to the large low-loss base with molded-in dams between the pins to discourage leakage currents, the 6550 was rated for 600 volts on the plate and 400 volts on the screen." I don't believe VTV back issues are on Millett's site and you may not consider Barbour an authority (he provides no references) but it's in writing and was published.


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