Tube DIY Asylum: RE: Google: "Jeremy Epstein 6C45P Phono Preamp page" by J Epstein Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by J Epstein (R ) on February 18, 2017 at 13:00:15

In Reply to: Google: "Jeremy Epstein 6C45P Phono Preamp page" posted by kurt s on February 26, 2011 at 20:36:09:

Dear me.

I'm just noticing this post, 6 years later.

I'm not sure who Kurt S. is or where he published his RIAA phono calculations, and since it's been 14 years since I wrote that article, I can't conclusively recall every source I used in gathering the necessary calculations, SEVEN YEARS before Kurt S. complained about my plagiarism. But it should be pretty clear that my main source was Morgan Jones, "Valve Amplifiers" which is cited at the bottom of the article.

I had no idea that a guy named Kurt S. had invented mathematics! Sorry dude, I'll be sure to cite you next time I add, subtract, divide or multiply anything.

I know full well I am standing on the shoulders of giants. I guess I just don't know all of their names.

2017 update: don't build the power supply exactly as it was shown in the "Rev 4" schematic: it will give you a low frequency "motorboat" oscillation. Every time. I have removed that part of the schematic. The lower image (main power supply drawing) is still Rev 4, that doesn't need changes.

I updated the power supply filter part of the main schematic up to Rev 5 to reflect this change, it's caused people pain every now and then for the past 14 years.

But they always like the way it sounds once they get it sorted out!

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