I owned a 2205 for about 15 years. It's a cool amp, but you need to do a few things to run it IMO. My findings after 15 years of fiddling were confirmed by Mark Cameron.
- Amp has a crap master volume circuit - doesn't sound good until it is up to at least 7 or so. So to control the volume use a FX unit in the loop or something that has input / output volume controls and use that to set your volume.
- Use an EQ in loop. Crank up the mids on the amp, and use the EQ to scoop them out. Also low end needs some EQ boosting typically as the stock amp doesn't have much
- The treble circuit is also poorly designed - run it at 0-2 tops, and use the presence to get the high end back + loop EQ
Use a combo of the channel vol and gain knobs for different gain / distortion sounds. I typically ran the gain around 8-9 all the time, and use the ch. vol as an extra overdrive - 6 was nice and tight and cranked up it got gobs of distortion.
- Hitting the front end with an SD-1 sounds killer - not required for getting the goods though. I tried tons of pedals and that one was my fav, esp. Keeley modded one. Nice for solos or tightening things up. I pretty much ran the gain at or near zero.
- The "clean" channel is crap IMO, never really used it. Very dull sounding. I added a bright cap across the vol pot and it helped alot - 60 cent mod ! Funny that Buddy Guy says he used 2205's alot and only used that channel - I can't see how!
So if you do what I said the amp really smokes w/ TONS o gain, otherwise I don't really like it, ha! If you aren't willing to screw around I'd say get a 2203/2204 - they sound better just plugging in, but the old ones have no loop and less gain so boosting is required.