Those of you talking about the Avenger, are you referring to the original Avenger with single input (which was the HR), the new dual input (Avenger), or the Hot Rod Avenger that has a loop? The loop will affect the sound if it's the same type of loop that's in the SLO. And I've read that the original single-input version was killer.
I'll do a search and see if there's a schematic out there of the Avenger and compare it to the SLO lead channel.
Preliminary search turned up this comparison of the 4th gain stage in each amp: