A number of visitors to this site have asked about power supplies for operating battery valve radios from the mains many later radios use four 7 pin valves and require a 90v ht supply at typically 12ma an. After two previous generations of my solar power supply receiving positive feedback on here and youtube i thought it would be time to share with you my third. Power electronics book list by jerrold foutz with emphasis on switching mode power supply design. Vinyl heaven 5 building the esp project 06 and project 99 a high quality riaa phono preamp
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