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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
will62 OP
166 posts
 
Thanks for the detailed info.  Very helpful.  I noted the THD on the old unit is incredibly low compared to the newer amps.  Should still be a very quiet amp.  But I would have to agree that it is probably not wise to drop a lot of money into it considering the age.  But will be sure to have all the parts that might be close to failing or are failing replaced.  Capacitors included.
will62 OP
166 posts
 
Just got the A 500 up and running.  Seems to be fine.  True to form it has a more neutral sound than the Denon PMA 520 that I also have.

Question.  Does anyone know where to find a manual for the A 500?  Can't seem to find one online that I can download.

Also, I am trying to determine what kind of speaker connection to use with the amp.  Won't take Banana's and I am not sure Pin's will work either.  Weird shape to the speaker connectors.
auxinput
1,538 posts
 
Actually any electrolytic capacitor can be replaced for an improvement.  Nichicon KZ Muse or Nichicon KW are the best I have used.
will62 OP
166 posts
 
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.
loomisjohnson
1,526 posts
 
the speaker connectors in back are just spring clips--pins should work fine, tho i'd personally use bare fire for 'em
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