| Waily, Ang Mo Kio, Singapore
Well done, Waily! Waily is using Marantz CD63, Roksan solid state power amp and Paradigm Studio Reference speakers. Waily can be reached at waily at yahoo dot com. |
Hi Yeo,
After weeks of tweaking, I finally concluded that those values that U used in the project is very very near to ideal(best) what a 5687 should sound. Maybe my preference for good sound is quite similar to yours, in expecting what a good, neutral sound on system should have. Or maybe my gear should match with this kind of sound. Here I would like to kow tow to you as I presumed that u've probably tried up quite a number of different values/ config before concluding and sharing this project with us and other diy'ers. Initially I thought that this humble preamp has'nt reach the full potential yet, hence the word TWEAK comes into my mind. But then, those original values definately has to stay in order for me to really enjoy all my favourite albums/cd. Of course, there is room for improvement, but does it really justify the total cost of the project, or the degree of improvement- branded coupling caps (hovland, multicaps, etc), black gate skz/wkz sound of music power caps, dact stepped attenuators, pure thicko silver hook up cable, lundahl or other expensive choke/ transformer, and much more parts. Ok, I might do that when I am very loaded and doesn't feel the pain of thrashing/ keeping those that sound unsuitable to me.;-) Remember the 100u+100u, I just took it off and in place back the 50u+50u. The smoothness, creamy voice has came back, dynamic is a bit slower - u can get to hear the singer voice extension very well. The 100u might sound much dynamic with Mohamad Ali punches in his fancy footwork and that of course, will very soon send u to K.O. (definately ngam those ah beng in honda civic with the windscreen wind down). One words, I can't take it anymore. Out u go. The opposite of things happen with the 25u+25u, it makes everything slow motion and dull, lifeless. Anyway, the 390ohm dubilier has found some use in this preamp..I put it in the grid resistor for fun and suprisingly it sound much better than the Riken but different values that I've tried (100,150,1K). I can safely said that this resistor ngam ngam roll off those tiring highs and the loss in sonic clarity is negligible. (of course, it cure my power amp shutdown too). To summarise, the only difference my circuit to you is only this grid resistor, 250K ohm alps pot, some cheap, thick solid core copper hookup cable, S$15 per pair bronze female RCA from Well Audio, pair of Welwyn 20K for the plate(well), others is riken (well) and 1000u cerafine cathode caps that i found it brings more mid and lower bass than the 470u (who knows I might revert bacck to 470 in future??;-), and of course this will varies from system to system.
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should give this project a try. Can be very cheap to build depending on
your choice of parts. Check it out at 
