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-   -   Help modding Music Hall dac 25.3 (http://www.diyaudio.com/forums/digital-line-level/196897-help-modding-music-hall-dac-25-3-a.html)

Bennyhaha812 19th September 2011 02:29 PM

Help modding Music Hall dac 25.3
 
Hi all, hope this is the right spot for my post. I recently purchased this dac, and being a compulsive tinkerer want to make it better. I purchased a 1960's nos French Mazda 7308 to replace the stock tube. Afterwards I intend to replace the stock op amps with the Burson units. These are simple plug in replacements. After this mod I have questions.

I will use photos from Burson Audio Blog: Burson Opamp upgrade to Music Hall DAC 25.2 as a reference for all interested in following and or helping.

1) How do I wire the Burson clock to the socket I remove the stock clock from?
2) The socket next to the fuses and directly to the left side of the board is changed. What is this and what is a good replacement?
3) I will purchase parts from Parts ConneXion - The authority on hi-fi DIY parts and components, and I know the 4 caps to the bottom left on the board are replaced with 4 Each - 0.01uF 600V AURICAP CAPACITOR. The yellow caps around the tube I will replaced with MUNDORF 3.3uf / 400V, M-CAP® MKP Series.
4) What should I replace the 6 caps around the op amp sockets with? I need to make sure I have room for the op amps.
5) What should I replace the the 16 resistors around the op amps with?
6) Should I replace the 8 resistors around the tube? If so what is recommended?

I am new to high end audio but love to tinker. I build my own pc's and run water cooled rigs that I overclock. I have soldering experience, can read basic schematics, and have a multi-tester. I will be using a Weller WES51 for all soldering. If anyone can help I would really appreciate the input!!! Please use the above link as a reference point for photos. If this post is in the wrong place would a moderator please put it where it belongs? Thanks a million to all!:xfingers:

acold7dusta 13th October 2011 05:38 PM

I made a spreadsheet a while back for my 25.2 with the intentions of modifying it. Hope it helps

https://docs.google.com/spreadsheet/...FJWGc&hl=en_US

edit: the link at the bottom has a lot of useful information, including how to wire the clock IIRC

H3D 21st January 2012 01:49 PM

schedule
 
Hi there, does anyone have an electrical schedule of the MH 25.3.

I'm esspecially interested in the fact that de opamps are in the signalpath of the RCA output.

I bought it thinking it didn't have any opamps whatsoever. I expected to change some caps and was curious what that would do. If the opamps are in the signalpath I think I'll sell it again. Original this dac is not far as good as my audiomat tempo2 (slightly modded) dac. But this one can't figure out 24 bit music :mad:


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