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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
georgehifi's avatar
georgehifi
10,312 posts
 
jdub3 In a thread on Audio Asylum , we had a great discussion a few years back with Mr. Curl who said if given the choice he would've used silver fuses in the Halo amps, I used the Silver Star in my A21 and the results kicked up several notches in refinement across the spectrum , there was a reason I kept the A21 around for 12yrs , it just flat out sounded so good!
Prove it with a link to it, AA retain all links.
jdub39
500 posts
 
Do your own research I was present! 
georgehifi's avatar
georgehifi
10,312 posts
 


Sorry! typical fuser, you quoted it, so prove it.
It’s bs if you don’t or can’t, simple as that.
jdub39
500 posts
 
Then bs it is! Lol , got other things to do!
vanson1
126 posts
 

Manufacturers will make a product if it's easy to switch out.

Cables, fuses, power cords. 

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