80's Yamaha JX55 Guitar Combo AmpNotes This listing is being sold as is This amp's power cord seems to have been replaced with a two prong switch. there is no ground pin. A 80's Yamaha JX55 Guitar Combo Amp in Very Good condition! At Evolution Music, we attempt to highlight cosmetic defects (if any) by picturing every angle of every piece of gear so you know exactly what you are getting. We always picture any and all accessories too. What you see is what you will get so please check