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In Reply to: RE: Stephen Robinson's Izzy Wizzy posted by Salectric on December 01, 2015 at 12:10:05
That's excellent, thank-you. It looks like we both have Shure M65 like preamps, can you compare the sound to that, or maybe some other phono stage preamps? Another preamp I am considering is the World Designs (WAD) phono 3. If you are familiar with it, any comments?
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The D3a/5687 is in a different league than the Shure M65. Even a scratch-built M65 like mine which uses pretty much cost-no-object parts has less detail and a smaller soundstage than the D3a/5687. Plus any 12AX7 based phono has noise issues. The SR design is very quiet, actually much quieter than any of the solid state phono preamps I have tried in my system. I have even run my 0.35mv output MC directly into the SR and while no longer super-quiet it had a lot less noise than I expected.
Thank-you for the fast response. Your suggestion has my interest. I hate to bother you, I'm not that familiar with the magnetics, would it be possible to post part numbers?
I am not sure what transformers and choke Stephen used in his build, but there is nothing sacred about his selections. I used standard Hammond power transformers and chokes in my preamp, but my power supply is quite different (simplified) compared to Stephen's. The circuit will operate fine with a B+ ranging from 225 to 285 volts. How you build the power supply to get there is pretty much up to each builder.
OK, thank-you for answering. I think I will try this, thanks again for the recommendation.
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