Tweakers' Asylum

How to improve a lousy receiver?

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I bought a cheap second-hand system for a friend who needs something to connect her turntable to.
Speakers are more than decent (JBL ES30) but the receiver is THE WORST I'VE EVER HEARD in 20 years in this hobby.
All plastic class H Technics SA-EX120.
I really thought, having owned a few Technics in the past, that this one would have a flimsy build but decent sound -NOT. It is nasty as hell. Slow and undynamic, with a muffled and dead sound and a decidedly nasal character. Damn :/
I could obviously tell her to upgrade soon but in the meantime there might be something to fo the help SQ a bit.
I've noticed electrolytics are generic and quite small values, even main caps. I'm thinking maybe I could replace those with something like Panasonic FC and dérate a little? There's two times 4700uF and two times 3300uF.
While I'm at it, anything else I could try? I don't feel like recapping the whole thing except if I hear it will bring stupendous results. I did it on my equipment but it is not lousy low-end crap.

Any suggestion welcome :)

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