I have no dog in this fight but that picture of the Sugden amp looked weird to me, no capacitors that I could see. Did some googling and this review:
http://www.hi-fi.com.pl/testy/ko%C5%84c%C3%B3wki-mocy/3465-sugden-masterclass-spa-4
Though in, I think, Russian has what looks like a more accurate internal shot of the SPA-4.
http://www.hi-fi.com.pl/testy/ko%C5%84c%C3%B3wki-mocy/3465-sugden-masterclass-spa-4
Though in, I think, Russian has what looks like a more accurate internal shot of the SPA-4.