Just wondering if anyone can tell me if there's much difference between the 6505 and the 6505+?
No there isn't. Seperate EQ for clean channel, so it's a bit more versatile, but it basically sounds exactly the same.
the + has an eq for each channel
doesnt it have an extra tube? or am I just being really stupid
Yea it has an extra pre amp tube. It makes marginal difference. If you're trying to decide which one to get I'd say the + coz you're getting every good thing people say about the 6505 and a little bit more.
I tried them all and I prefered the tone of the combo. I now see why EVH used this on stage/in the studio over the heads. The tone of the combo is Godly. All I did was retube it and put in two custom voiced Emmy Legends out of a brand new Vader cab. The combo has a totally useable clean and reverb. You can always plug into a 4X12 also. Give them all a listen A/B/C and you'll see exactly what I mean.