Hello. I am a longtime user of Ampeg amplifiers. Over the years, I have mostly used an SVT-2 or an SVT-4 at my gigs. They both have tone and features that work for me - but I have been considering something a little different. It is fairly common for me to use an Upright Bass and a bass guitar on a gig - so for convenience I have been considering a two channel bass rig. I recently picked up an Ampeg Portabass 800 (two channels - up to 800 watts @ 2 0hms) - and although it sounds very good (with a good speaker cabinet) - it is not quite in the same league as the SVT models. I guess I just prefer tubes and graphic eq's. So I put a bid on a couple of SVP-Pro preamps on Ebay. I was surprised that I won both as my bids were not very high. I have received one and had a bit of time to mess with it. I plugged it into the signal path of the Portabass 800 (into the -12db instrument input) and it really made that amp come alive. I was playing it through my Pro Neo 410HLF and I could not ask for a better range and quality of tones (I have not compared it side by side to anything yet). So now I am considering all sorts of options. I think I can use one SVP-Pro as a second channel with the SVT-4, or use or two with the Portabass 800, or get a power amp that ideally would be light weight, two rack spaces and $400.00 or less (used or new) and sell the Portabass 800. I am finally starting to consider weight as an issue - but I still cannot imagine selling my SVT-2 or 4 because I have had so much trouble-free history with them - but if I found a pre/power rig that sounds great and is reliable and light weight, one of the SVT's may have to go in the future. Thanks for any input.