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Old 24th March 2005, 08:22 AM   #21
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I own a premodded DacMagic 2. Think it was modified bij some dutch wizard, Mr. Raatjes. Should check tonight
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Old 11th December 2005, 08:42 AM   #22
sbrads is offline sbrads  United Kingdom
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Default Re: Soft recovery diodes made a big improvement on my friends DACmagic

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Originally posted by tubenut
Possibly one of the biggest improvements we got out of all kinds of tricks were replacing all the diodes to I think BYT53.

Inspired by this and by articles on snubbing on amplifier power supplies, I opened up my much loved Dacmagic 2 for the first time since I purchased it new umpteen years ago and fiited a few R's and C's. Hendrix is now playing twice as many notes on a BBC live studio session, so the improvement is real enough. Overall, a haze I didn't know was there has been removed. I suspect that clock jitter has been reduced indirectly by the reduced level of diode capacitance/leakage inductance HF ringing upsetting the clock. I'm only guessing of course, but it's that sort of audible improvement that clock upgrade boards are famed for.

I used 8R2+47nF ceramics in series across each secondary, mounted at the diode bridges. It's easy enough to buzz out what goes where if the transformer secondaries are unplugged. I also fitted a ferrite doughnut to the incoming mains wire with 3 turns going through it. I may take the snubbing and filtering a bit further after this but I want to live with this for a while.
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Old 12th December 2005, 06:56 PM   #23
tubenut is offline tubenut  South Africa
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Quote:
Hendrix is now playing twice as many notes on a BBC live studio session, so the improvement is real enough. Overall, a haze I didn't know was there has been removed.
Hope the removed haze was not purple.... That would not be good....
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Old 4th April 2006, 07:04 PM   #24
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I'm pretty sure that C9 & C79 are the signal capacitors, but are the DC blocking caps C5 & C74? Instead of OS-CON (for C5 & C74) I'm going to use BC-Vishay SAL-RPM 128:
Quote:
LCAudio
What makes the SAL caps sound better is the fact that the plates are held in place with a solid potting compund that prevents any kind of microvibration when curents run throung the capacitor. SAL-RPM capacitors are also great for DC blocking caps in small signal applications like CD players, preamps etc.
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Old 4th April 2006, 07:35 PM   #25
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Forgot to mention that I use the balanced outputs on a DAC 3.
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Old 4th April 2006, 08:08 PM   #26
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Tell us more!

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Old 4th April 2006, 09:32 PM   #27
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Glad to see that the DacMagic continue to have admirers.

For a detailed information sheet with links, etc visit

http://www.gbaudio.co.uk/data/dac2.htm
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Visit M-Audio Super DAC 2496 group at
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Old 4th April 2006, 10:59 PM   #28
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I'm a cheapskate, so I'm holding on to my dac a couple of years, in the near future I've probably ripped all my cds (loseless) and bought myself an USB-Dac.

This is what I'm going to do with my dac:
  • 3 spikes resting on a telephone catalog folded in two (300 pages with some air in between).
  • Bitumen mostly around the transformers (getting rid of the humming).
  • Ferrite doughnut on the wires from the transformers feeding the board.
  • Replace main digital caps bank with Elna RJH 2200 & 3300 μF/ 25V.
  • Replace signal caps (C9 & C79) with OS-CON 15 μF/ 16V.
  • Replace Op-amps with LM6172IN (more suitable for bit-stream converters).
  • Replace DC blocking caps (C5 & C74?) with BC-Vishay SAL-RPM 128 10 μF/ 16V (LCAudio claims it's better than Black Gate).
  • Replace all diodes with Schottky 11DQ10.
Total 46 here in Norway (a few years ago I fitted the Dac with LClock XO).

The only thing bugging me is where the DC blocking caps are located, I'm a DIY-beginner
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Old 5th April 2006, 07:34 AM   #29
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Would these shunts be a nice upgrade for the Dac?
http://www.tentlabs.com/ProductEntit...unt/Shunt.html
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Old 5th April 2006, 02:34 PM   #30
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Yes, but a 5-pack is priced at 175 euro
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