Description: This is the schematic symbol of an old radio tube from the 1940s Its the UBL1 DuodiodeOutput Pentode
By: tomelec
Date: 2012-08-24
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Filesize: 5006
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Radio Tube Ubl1 sourced from Openclipart is licensed under CC0 1.0
* Note: Date might not match original source and might be an educated guess.