SWR 550-X bass amp for sale. 550 watts @ 4 ohms, 375 watts @ 8 ohms, built-in subwave effect. I bought this amp used, and encountered a problem with it losing volume. I have had it looked at twice by an authorized SWR technician (Logical Audio, www.logicalaudio.com), and it is now certified fixed and trouble-free. On the second visit, they discovered a problem with the preamp tube socket, which they repaired and reinforced so it won't occur again. The entire inside of the amp was cleaned, and all connections were resoldered and checked. I have replaced this amp with a pre/power set-up, so I'm putting it up for sale for $400 + shipping, as is, no refunds, no returns. Not interested in trades. Any questions, let me know. Thanks! EDIT: I used this amp on one gig, and jammed through it in my basement for 45 minutes or so.