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About 3 years into production it occurred to me that some further filtering in the main B+ supply would improve detail at mid and higher power levels. That was accomplished by adding two chokes and two filter caps making a separate pi filter for each channel. These chokes are rather special in that their winding resistance is only 5 ohms. At the same time I updated a few things that customers had requested. Speaker cables were getting bigger so bigger binding posts were provided. I had them custom made to my design in solid copper.
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