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Old 13th September 2008, 02:38 PM   #11
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Question Power 5V

Hi Cobra,

Thank you for the information about all the modifications.

I purchased the DA-500 DAC from "Stofnest". He already did some modifications, he replaced the opamps and the diodes. Your little clock-"bug" was also introduced in this nice machine.

- I replaced the power capacitors by larger Panasonics FC
- Installed some bypass amps Vishay MKP 10nF near the mute relay.
- Installed a XY-capacitor in the power cord
- I improved some of the connections made by "stofnest"

This mods makes the DAC even more nice! Easy to do and great improvements.

Now I would like to do the 5V trick with the unused voltage line. The 7812 is getting very hot (is this because the opamps are changed?), so I think this trick is good to relieve the load. And if it sounds better it is even more nice!!

I was wondering where you connected the (-) from your mod?
Did you cut only one power supply line?

May be you can show your connections/ cuts into the attached image.

Thank you!
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Old 13th September 2008, 02:38 PM   #12
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Lightbulb Vishay MKP Capacitor

This is how I installed the bypass caps:
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Old 13th September 2008, 02:38 PM   #13
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Default Elna / no name

I noticed that in some versions of the Denon DA-500 all the capacitors are from Elna. In my version there where some cheap no name caps. So I replaced them for Elna's Cerafine. I really don't know if this upgrades the sound quality. . .
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Old 14th September 2008, 02:34 PM   #14
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Hi,

what envy , man !
I'm searching desperately a used DA 500 but I can't find one
I like it very mutch because it has the Alpha Processing and the
impulse response looks better than Wadia .
Have you thinked to skip the I/V ic and make it passive?

Cheers,
Paolo
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Old 16th September 2008, 11:18 PM   #15
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Cool Update

I installed the PSU upgrade.

Cut the input power line to the "7805" and drilled a hole for the new connection from the diode bridge (rectifier). The min connection is connected to the central min.
More pics will follow.
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Old 16th September 2008, 11:18 PM   #16
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Cool PSU upgrade

This is how it is installed:
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Old 16th September 2008, 11:18 PM   #17
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Cool Final stage

Hi Inertial,
I can imagine your envy, it has a nice sound, and seems easy to improve it.
I did not think to skip the I/V ic, what is the use of doing this?

- a XY-capacitor is also installed
- I connected the ground to the IEC socket and the XY capacitor
- Extra aluminum is attached to the radiators
- The PSU upgrade uses skottky's a large capacitor and a small bypass cap.

To be honest, i'm not sure if the sound made improvements. . . but The 12v unit doesn't get hot any more. So that is a plus.

When I installed the LME49720NA opamps in the center the dac was interrupted when I switched a light on or off, that is why I installed the XY cap. In the active filters is the Opa BB2134 used (thanks to Stofnest!) I have to change them in the future with the 49720 to check if the sound quality will change.

I think it is ready for now. I only have 2 digital inputs, but when I have more in the future may be I will change the optical ones to coax......
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Old 17th September 2008, 08:53 AM   #18
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Hi pmd-audio,

It's matter of audio-philosophy.
I image you are a solid-state guy, I' m a triode guy
The I/V passive would be a step into targeting a modd ala Thoersten Loesch
Anyway have fun with your modd

Cheers,
Paolo
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Old 19th September 2008, 03:48 AM   #19
wa2ise is offline wa2ise  United States
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Quote:
Originally posted by inertial
Hi pmd-audio,


I image you are a solid-state guy, I' m a triode guy
The I/V passive would be a step into targeting a modd ala Thoersten Loesch


Cheers,
Paolo
I'm a vacuum tube guy myself, and I've modified CD players that have DACs with I out with I/V passive (resistor) circuits that feed into triode buffers or amplifiers. See
my vacuum tube CD player mods page here
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Old 19th September 2008, 08:58 AM   #20
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Hi wa2ise,

well done

the best audiophile method to avoid the "digital sound"

Cheers,

Paolo
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