http://www.philjonespuresound.com/PJWeb11_Briefcase.aspx New: Solar Powered! The PJB Solar Powered Bass Amp It's a Briefcase with Solar Panels. Click below to read the "Bass Gear Weekly" review of the Solar Amp. Phil has taken his small combo, the Briefcase, and found a way to power it from solar panels. Yes, dear reader, there is a solar-powered bass amp. For those of you that don't know the PJB Briefcase, it is a very small bass combo that's quite unconventional. Since it's the core of the Solar Amp, let's review it, and you'll see how taking it solar is actually quite logical...