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17th May 2007, 05:28 PM
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diyAudio Member
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
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The HP23 is a power supply for ham radio transceivers -- it is overkill for this application. The EUW-15 is a nice regulated supply, the schematic is available on the web, no bias supply but you don't need that for the preamp -- as long as the heaters are wired for 6.3V.
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Power supply for Heathkit
