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Parasound a21 upgrades

Bought a lightly used 2 year old Parasound A21 some days ago. It has exceeded my expectations for sure. Right up my alley warm mids and non aggressive highs but also dynamic and tight with lots of headroom. 
Are there any mods that are reasonable to do to these amps? Fuses etc. Can the bias be safely increased to add more class a watts? 
Also have there been any changes over the years? So is a 2 year old A21 the same as a 15 year old one? 

Thanks
mofojo
mofojo OP
2,168 posts
 
Thanks Eric,

Just for my own curiosity what would be an amp that you would see as a clear upgrade to the A21 not priced in the stratosphere. Similar power specs let's say 6k or under new price. 
russ69's avatar
russ69
3,360 posts
 
The latest version is the A21+, maybe Parasound can tell you what's different and maybe they have an upgrade program. 
ricred1
1,974 posts
 
Parasound JC5
erik_squires
15,630 posts
 
Hi OP :

Luxman and Ayre are brands you should listen to which you can find in that price range used.

Best,
Erik
jdub39
486 posts
 
The JC5 is the clear upgrade at 6k, one could argue go for the A21+ and save some coin as from what I understand it's a refined A21. I switched to the JC5 after many years of musical enjoyment with my A21, I did upgrade it's main fuse twice with fantastic results , one was the HiFi tuning Silver Star and a few years later the Supreme. I do however recommend the Xlr's and a good powercable  of choice. And as noted above if your room isn't acoustically treated do so.

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