I still own a Threshold S350e and a Fet 10e preamp, it works just as good as it did when I bought it 30 years ago. Funny, when I spoke to one of our repair shops regarding possibly needing recapping, he said it’s a myth. Basically said if it ain’t broke don’t fix it. He said the caps are good for many, many years and that people seem to think they need recapping every few years. Not my words but his.