I'm looking for a small, light and cheapish bass amp for my upright, which has an Underwood pickup. This would be to play jazz. I have a 15" speaker cab, 8 ohms. I'm in the UK, in case anyone can recommend places to buy such an amp. I don't want to throw money at this, since I build tube amps as a hobby, and will eventually build something myself - at least a small preamp. Might need it soonish for a rehearsal band. All recommendations welcome, including ideas for separate preamps/tone controls and power amps.