Can anyone tell me which of these is better. Im not sure what the diffrence is besides wattage and the tube, also what does a tube preamp do?

1. Ampeg BA300/115 1 x 15 Bass Combo


2. Ampeg BA115HPT 1X15 220 Watt Bass Combo Amp

Neither. Ampeg combos leave much to be desired.

For 700, you can get a Carvin combo, Ashdown stack, Fender Pro combo (I think), tons of other stuff. The BA stuff isn't well designed, and Ampeg's quality has gone down since they started being MIC.