Wrong resistors, amp damage

[ricci]

I’ve no experience of those brands. I’m doubtful of making such snap judgments based solely on brand. What are the detailed specs, eg max operating temperature, operational life?

What causes you to suspect the caps you’ve bought of being poor quality?
Did you buy them from a manufacturer approved distributor / reseller?

Perhaps consider buying a cheapo component tester that includes ESR, so the old and new caps can be assessed.

I bought them on eBay with these values
Jamicon 2200uF 50V, 105 ° C ESR 0.16 and Vloss 0.6%
Samwha 2200uF 63V, 85 ° C ESR 0.16 and Vloss 0.6%
Even the original ones from 35 years ago had these values when I measured them.

[Helmholtz]

If the original caps still measure 2200µ and ESR = 0.16R, I would only change them if there are signs of increased leakage.

How do you measure Vloss (whatever that means)?

[ricci]

If the original caps still measure 2200µ and ESR = 0.16R, I would only change them if there are signs of increased leakage.

How do you measure Vloss (whatever that means)?

Vloss with Lcr-t4 multimeter in the attached photo

[Jazz P Bass]

A word of caution.
This type of component 'tester' has more value as a component 'identifier'.
I have had capacitors that would not work in circuit & they 'tested' fine.