"universally accepted amongst those who do such work that the filter caps in the power supply should be among the first things to be changed during a restoration"
I agree. I would also like to have caps changed during restoration of old amp but would not do that otherwise (without a cause).
I assume that amps with minimal feedback are less forgiving but issue of increase output impedance (ESR of capacitor) is complicated one. My class D amp with DF=4000 at low frequencies sounds great with my speakers. I'm pretty sure that increased output impedance might make it sound better with other speakers. In such case audiophile satisfied with great sounding older amp replaces caps, following advise of an "expert", for the worse sound. Do I make sens?
I agree. I would also like to have caps changed during restoration of old amp but would not do that otherwise (without a cause).
I assume that amps with minimal feedback are less forgiving but issue of increase output impedance (ESR of capacitor) is complicated one. My class D amp with DF=4000 at low frequencies sounds great with my speakers. I'm pretty sure that increased output impedance might make it sound better with other speakers. In such case audiophile satisfied with great sounding older amp replaces caps, following advise of an "expert", for the worse sound. Do I make sens?