diyAudio (
-   Digital Line Level (
-   -   Help modding Music Hall dac 25.3 (

Bennyhaha812 19th September 2011 01:29 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 04:38 PM

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

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

H3D 21st January 2012 12:49 PM

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:

All times are GMT. The time now is 12:43 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 18.75%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio