|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
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.