Help modding Music Hall dac 25.3 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th September 2011, 01:29 PM   #1
diyAudio Member
 
Join Date: Sep 2011
Default 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!
  Reply With Quote
Old 13th October 2011, 04:38 PM   #2
diyAudio Member
 
acold7dusta's Avatar
 
Join Date: Sep 2009
Location: Buffalo, NY
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
__________________
Squeezebox Touch>Coax>MH Dac 25.2>Marantz PM-15S1>Seas Thor (Small)/Beyerdynamic DT770

Last edited by acold7dusta; 13th October 2011 at 04:49 PM.
  Reply With Quote
Old 21st January 2012, 12:49 PM   #3
H3D is offline H3D  Netherlands
diyAudio Member
 
Join Date: May 2009
Default 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
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shanling Cd-S100/ Music Hall 25 (25.2) fluorescent display source? limono Parts 2 5th August 2011 01:22 AM
Music Hall CD 25.2 $400 Michael Rothacher Swap Meet 0 2nd May 2010 08:54 PM
music hall cd-25 problem kenton shoemake Digital Source 1 28th September 2005 12:07 PM
Music Hall CD-25 Cap values? andrzejpw Digital Source 0 15th May 2004 10:13 PM
Music Hall mmf cd 25? woody Digital Source 0 20th October 2003 12:16 PM


New To Site? Need Help?

All times are GMT. The time now is 02:59 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2