Upgrading amplifiera.

do it before the electrolytic caps blow up

otherwise, not the most important aspect of SQ - speakers, room, cartridge/turntable, DAC all come first

Do most people send their amps in for repair, then have the repair guy say, " I have some great upgrades for this amp ". 

Kalali, I was trying to be humorous, but you essentially have tubes, caps, and resistors in the signal pathway. And there is practically no upper limit to how much you can spend on the caps. :)

Best,

E

Some companies are really good about the upgrades in terms of price, they want to keep there babies up and running and owners happy. I think others view it as a money making proposition. $1,200 for these "fabulous new caps " etc. On the down side if you ever do sell your amp the upgrades don't count for much and can be a liability. ( who did the upgrade and how was it done ) can raise other issues with the buyers.  

I would say let the manufacture do the upgrade. That should help the resale value and the sound. Some of these guys think they can just ad " audiophile caps " and that is going to make it sound superb. Not so sure that is always the case.