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

Showing 1 response by jetter

@erik_squires, if memory of your prior posts serves, I thought you have previously owned the Parasound A23, which sells for about half the price and has about half the watts of the A21 the OP has purchased.

Where the A23 could be considered Parasound’s entry into their higher end line, not so the A21. Whether you care for the warm sonic voicing of the amp is personal preference.  Note that the A21 remained unchanged for 17 years before the upgrades performed in 2020 resulting in the name change to A21+.