It seems that your question has been asked several times over the years, but I didn't find an answer.
Probably best to post this question over at the Peavey forum
I had the white Firebass for several years. It was a solid amp (true to Peavey's reputation).
MIA P & J, Jule Monique Rack, Crest ProLITE 2.0, Thunderfunk TFB750-A & 550B, Aguilar GS112 stack, fDeck Series 3, Thunderfunk Club #35