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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
2,306 posts
 
Thanks for the suggestions. I think I will take Eric's advice and leave it alone. I do really like the amp. Added dedicated 20a circuits today. Nice improvement! 
smrex13
645 posts
 
If you haven't already, you might try some vibration control.  Just three Stillpoints minis, for example, will provide a very significant sonic improvement.  And then you can go down that rabbit hole instead of spending more on a new amp :)
georgehifi's avatar
georgehifi
10,312 posts
 
Right up my alley warm mids and non aggressive highs but also dynamic and tight with lots of headroom.
What more can you want, John Curl's not an idiot, if he thought a "snake oil fuse" would make a difference for the better again he would have put it in.
Don't listen to these "fuser twits" here, they have absolutely no idea, and that's about their technical skill limit, to change a fuse, so that's all they will do and comment on.

Cheers George  
mofojo OP
2,306 posts
 
Agreed. Like I said I very much like the amp. I'm sure multiples in cost would likely bring an improvement. I'm good to go for a "long" while. I think. Dedicated lines today are a big improvement"no sh.t. and the longer I listen not snake oil. I had nasty s**t on those lines. 
jdub39
498 posts
 
Ha  ha says one twit . 
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!
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