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Marconi R.B.7.
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12th Oct 2019, 8:45 pm
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FERNSEH
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Re: Marconi R.B.7.
From tube collection,de
More images of DEV and Q valves
http://www.tubecollection.de/ura/marconi.htm
DFWB.
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