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-   -   Yamaha AX-930 (http://www.diyaudio.com/forums/analogue-source/39877-yamaha-ax-930-a.html)

jleaman 24th August 2004 07:04 AM

Yamaha AX-930
 
So i got my old amp back what a good feeling this is.. it was my first amp that was given to me to have for free that i fixed long long long time ago. so i have it now back in my hands and would like to do some mods to id. im thinking about replacing all the resisters with metal film and matching all the transisters since one channel is difrent. and maybe some psu stuff any one got any sujestions / the schematic for this amp.. ?

jleaman 28th August 2004 08:09 PM

2 Attachment(s)
ok got some pictures of the amp.. starting this project soon.. WOOT!!! any one got a schematic though so i can properly set the bias.. ?

anatech 2nd September 2004 02:33 AM

Jayson,
Do not replace all the resistors with metal film. If you must, some in the signal path in the front end, okay. You should see if this model runs the tone controls in the feedback network. Yuck if so.
I think that matching the transistors is a good idea if you are replacing parts in a damaged amp or building one from scratch. I wouldn't do this with a working amp.
This is not a bad sounding mid range amp, but it will never improve greatly. There are issues with power supply and PCB layout that you can't reasonably get around. Treak it a bit but then just enjoy it for what it is.
-Chris

anatech 2nd September 2004 02:35 AM

Jason,
I just though of this. Yamaha manuals were not badly priced as I remember. Why not just call Yamaha (in Scarbourough, Milner Dr.) and order the manual? You will need it if you are modifying.
-Chris

jleaman 2nd September 2004 02:57 AM

2 Attachment(s)
Transisters are a must to get replaced.. another is a rebias : O) then ill start on metal film's in the amp. then to start in the psu. im so suprized to see 22k caps in here WOAH!!!


See pic...

now i just need to fund the schematic..

jleaman 2nd September 2004 07:18 AM

in my picture above it shows that teh outputs have been changed. : O ) so now i want to make them matched and start working on the preamp gain stage and ect ect thigns.. this is a realy godo amp i like it alot and is sounds really good. also it is heavy .. teh volume pot is getting changed to a alps maybe a motorized one. i dunno yet.

J'

edyedyi 21st November 2010 12:43 PM

YAMAHA SA-930
 
YAMAHA SA-930 amplifier that is not quite so brilliant in terms of transistors final two speakers if connected with lower impedance enters the protective, I would replace these end MJL21194, MJL21193,SANKEN END IS NOT TOO SHINE


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