I have an old Kustom TRB400 head(400W tube/solid state) with a Kustom 4x10 cabinet. It is in good condition and has the black padding all around it. Does anyone know anything about these? I was thinking about selling it for a GK Backline 600 combo. I cant find any info on google about them. I have had it for a while and it seems to do the job for me. Great tone and looks. Should I hold on to it or trade it for? What could I get for it??