Howdy audioreview members. I have an NAD 3150 integrated amp which is having issues with the right channel coming in and out (very annoying!). As most of you know, this is an older amp from the late '80s. There is a guy on Ebay who will do an upgrade for between $250 and $300 including shipping. I liked the sound of this amp before it started having issues. The Ebay dude said that he can improve the bass and imaging of the amp. Would you guys spend the money? I do like collecting pieces and I think it would be cool to have in my collection. Thanks!