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 Post subject: Cunningham C-11
PostPosted: Dec Sat 02, 2017 4:05 am 
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Joined: Sep Mon 18, 2017 2:23 am
Posts: 107
Location: Plymouth, MI
Is the Cunningham C-11 tube any better than the RCA WD-11's? If the filament blows on a C-11, can it still short the B voltage and blow up a radio?


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 Post subject: Re: Cunningham C-11
PostPosted: Dec Sat 02, 2017 5:03 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 36074
Location: Livermore, CA
Both C11 and WD11 are the same and made by Westinghouse.

If the filament blows usually it's stopped from shorting by hitting the grid. It could short to plate which might damage the B supply..

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Norm


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 Post subject: Re: Cunningham C-11
PostPosted: Dec Sat 02, 2017 9:11 pm 
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Joined: Sep Mon 18, 2017 2:23 am
Posts: 107
Location: Plymouth, MI
Thanks again for your help Norm.

Dan


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 Post subject: Re: Cunningham C-11
PostPosted: Dec Mon 04, 2017 12:59 am 
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Joined: Jun Wed 08, 2011 2:33 am
Posts: 6088
Location: Ohio 45177
They will work fine in your Aeriola if you have one. With moderate or occasional use, it ought to last as long as you do, if care is taken each time you bring it up. I would have hoped that by the time they moved from the brass base tipped ones to the C-11 production, they might have learned how to move beyond some of the weaknesses, or production improvements, but maybe not.


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 Post subject: Re: Cunningham C-11
PostPosted: Dec Mon 04, 2017 3:14 am 
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Joined: Sep Mon 18, 2017 2:23 am
Posts: 107
Location: Plymouth, MI
Thanks for the input wazz!


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