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 Post subject: Radiola III WD-11 to UX-199 conversion.
PostPosted: Dec Tue 27, 2011 3:11 am 
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Joined: Dec Mon 26, 2011 10:43 pm
Posts: 3
I am restoring a Radiola III and would like to convert to UX-199 tubes. I understand RCA issued Service Bulletin #6 (Dec. 11, 1925) showing how to convert the Radiolas III and III-A to UX199 and UX120 tubes. Does any one where I can find a copy of the bulletin or tell me how to convert to the UX-199? I plan to make an adapter to plug the tube in but the voltage and current requirements of the WD-II are; 1.1V and .25A, the UX-99 are; 3.3V and .06A. How do I compensate for the difference?

Ed


Last edited by retroradioman on Dec Tue 27, 2011 10:44 pm, edited 1 time in total.

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 Post subject: Re: Radiola III WD-11 to UX-199 conversion.
PostPosted: Dec Tue 27, 2011 3:54 am 
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Joined: Mar Sat 14, 2009 5:56 pm
Posts: 4555
Location: VA 22602
You will either have to change tube sockets or make tube adapters to change the radio from WD-11's to 199's. A tube manual will supply you with all the information you need to make the change. I have built both adapters to allow me to test WD-11's in my Hickok and adapters to use another 1V tube in place of a WD-11 in a Radiola III.

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 Post subject: Re: Radiola III WD-11 to UX-199 conversion.
PostPosted: Dec Tue 27, 2011 8:03 am 
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Joined: Oct Sun 18, 2009 5:38 am
Posts: 3417
Location: Tyler, Texas 75707-4212
You may find this article of interest:

http://www.antiquewireless.org/otb/wd-11.htm

As well as these threads:

http://www.antiqueradios.com/forums/vie ... hp?t=59470

viewtopic.php?t=55058&view=previous

http://www.antiqueradios.com/forums/vie ... p?t=165937

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