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In Reply to: RE: LOL ! posted by gusser on January 28, 2013 at 17:44:17
...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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The Mind has No Firewall~ U.S. Army War College.
forgot about that article, but Barbour did get it from elsewhere.Thanks again,
Stu
Edits: 01/30/13
No, I do consider Eric an authority and thanks for some valid documentation.
But I still question the effectiveness of 1/16in of additional distance. I know this can be calculated and perhaps has some advantage however small. I guess even 50 volts of additional capacity could be significant at 500 to 1000 volts.
It just seems to me that the barriers serve more of a structural purpose to support the center locating pin.
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