File:Rail To Rail Operation 1970 H-H Electronics TPA50 Professional Power Amplifier Power Switch.jpg

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A H-H Electronics TPA50 Professional Power Amplifier manufactured in Cambridge, UK during the 1970s - Photo by PT35

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current	20:47, 1 March 2012		800 × 600 (66 KB)	Beichner (talk \| contribs)

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