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2020, June 22 - 09:26
SzBálint
SzBálint's picture

hello:

https://elektrotanya.com/showresult?what=Philips+456A+&kategoria=Minden&kat2=Minden

https://www.radiomuseum.org/tubes/tube_1821.html

http://www.r-type.org/exhib/aaa0766.htm

Bálint

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