voltage conversion

So I have this bass amp that was purchased in Hong Kong years ago and works on 230 volts. I want to get it to work at 110/20 volts without a step transformer. Any advice would be welcome. Info: 230 50/60Hz T1A 250V power fuse Other listed voltages: 100 volts = T2A 110 volts = T1.6A 230 volts...