I have an Onkyo A919- circa 1992. so it's not exactly a vintage. It's a mosfet/bjt hybrid amp and the tubiest SS sound I've ever come across. It also smells like burning styrofoam. From sticking my nose to the components, I'm certain that it's coming from the circuit boards. I already had one bad experience with a vintage Sansui au-D907 that was stinking from the circuit boards due to it's age. (phenolic boards smelling like roses... and ***) But to have the same symptom from an amp that's only 8 years old is a surprise to me. Is my situation unusual? Could this 100V only amp being operated on 115V stepdown by the previous owner have accelerated the degradation of the pcbs? and what exactly do you think is contributing to this burnt styrofoam/industrial solvent-like smell?