Re: 6505?
Having owned a 5150 combo, Ultra 120 ( original blue stripe version) Butcher and VTM ( now for the 2nd time) I think the VTM is the best sounding rock amp they have. My beef with the Ultra, original early 90s version and the 5150, is that they are too hard dynamically and too bright. They are voiced for a ton of gain and the sacrifice for that is nuance, dynamics, chime, warmth ect... The dip switches on the VTM allow for you to go hard and 80s upper mids or more open and 70s style. I think it is a much more dynamic voice for rock music. I have tweaked mine just a bit, useing the JCM 800 warming mod. Simply swapping out the 470k resistor between the input jack and volume and clipping the 470 pF cap tied into it, will make for a full, fat, vintage rock sound, with tons of gain if you desire, but no upper mid snizzle and much better note clarity. Now it won't do the 3 channel Ultra thang, but my channel switching now involves just rolling off the volume to get my clean... Personally, if you are looking for a high gain amp, the Ampeg v140h from the late 80s early 90s, is a screamer with much better natural tone than the 5150, XXX or Ultra. IMO....