Getting it Right!
Adriaan- Amazon.com: Gilbert Kaplan Mahler: Symphony No. 2 "Resurrection": Gustav Mahler, Gilbert Kaplan, John Hugh Thomas, London Symphony Orchestra, The Ardwin Singers, BBC Welsh Chorus, Cardiff Polyphonic Choir, The Dyfed Choir, Benita Valente, Maureen For
Mahlers 2nd is tough to listen to no matter who recorded it. This version gets to the heart of a 29 year old obsessed German composer in the throws of figuring out what life is all about. Most versions are prettifed, totally missing the point. All great music, pop to classic, must reflect the tone and temper of the time. Get this recording right and your system is "on song"!
You are correct these caps are 330uf.http://www.nichicon.co.jp/english/pr...f/e-con_lg.pdf
I assumed the board was correct and never looked up the values. Kevin state they are 470uf Nippon caps on the Ebay add, I assumed that was a typo and they where 47uf. Humm. Well obviously the 47uf Blackgate FK's work fine in all the decoupling applications on the chipset board in my Mod Dac. I can tell you any bigger than 47uf 16v and the FK's would not fit on the board. (In the future I will install the original caps 8 chipset caps and see if anything changes.Plan is to salvage these caps for the C-Dac Chips)
The voltage for the chipsets is regulated down to 5V with the LM317T and futher reduced to 3.3 volts with two smaller surface mount regulators. Older Chipsets/Dac's ran on 5V while the newer Chipsets/Dac's on 3.3V. We are dealing with a mixed ship here. Point being, I can't imagine with this low of voltage/current they found the need for such high value decoupling caps. Maybe they had a surplus of them. Maybe these LG caps Kung Fu is weak requiring a larger value, who knows!
Fact is the 220uf Blackgate FK for decoupling the LM084CT regulator has just the right Kung Fu kick. The LM084 is set to output 7.8 volts directly to the Dac chips. This is the current that ultimately creates the analog output voltage and is very crucial. Simply sticking another one of those tiny OS-Can caps in this positions is a mistake. You need a big "fast" reservoir here. The nice thing is there is plenty of room to plug in bigger caps here.
Besides the Cryo Dip and 600 hours of break in, nothing was done to the C-Dac. Adding just this cap drastically changed the dynamic landscape of the Valab Dac. Putting a 1000uf BG FK maybe overkill at this postion... maybe not! However replacing the three 1000uf filter caps upstream with the 1000uf BG FK's will further the dynamic cause. These 4 caps plus the 8 on the Dac Chips are what create the overall drive of the analog output section. Careful filtering, matching and balancing of this power supply path is of the utmost concern. You want Kaplan's Mahler to sound right, then this is the path.
With a Dac as simple as the Valab everything matters. My next change to the Mod Dac will be hooking up a car battery in place of the AC power tranformer. Believe it or not every battery sounds different. I hear the best are the new fiberglass gell cells. Myself I really dislike the fact that that AC transformer is buzzing away on my finely tuned board. Maybe it's no big deal. Time will tell.
Sorry this is the version of Mahler's 2nd I actually own.http://www.amazon.com/Mahler-Symphon.../dp/B00009Y30W