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http://www.radiomuseum.org/tubes/tube_tda1002.html
http://pdf1.alldatasheet.com/datasheet-pdf/view/172718/UTC/TA7343AP.html
http://www.radiomuseum.org/tubes/tube_a110d.html
Circuit Ideas:- http://www.electroschematics.com/tag/lm339/
[Only available until stock depleted] Datasheet is here:- http://www.amapro.cz/datove_zdroje/katalogy/katalog_tesla/katalog_tesla_82.php
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