Yamaha A 500 Integrated Amp Modifications


I just bought a A 500 amp circa 1984 model off Ebay.  Owned one of these for nearly 8 years from 84 to 92.  Nice clean sounding amp.

I was wondering if there are any modifications that can be done to this amp that might improve the soundstage and perhaps also the imaging of the instruments?  I don't want to change the sonic character of the amp which is pretty neutral.  

Has anyone done any modifications to this amp or another Yamaha and noted some real improvements to the sound?
will62
Actually any electrolytic capacitor can be replaced for an improvement.  Nichicon KZ Muse or Nichicon KW are the best I have used.
Thanks.  Will consider that.  Right now my primary concern is trying to find a way to get cables to connect the speakers to the amp.  Want to Biwire and would like to avoid spades or bare wire.
the speaker connectors in back are just spring clips--pins should work fine, tho i'd personally use bare fire for 'em