Hey Myles, I've got a Rivera Knucklehead Reverb and a question. I'm not sure if you're familiar with this specific head, but it's a 3 channel with 4x EL34s and the following preamp tube layout (from Richard's Rivera Amplifier Page: V1 - First Gain Stage V2 - Second Gain Stage for British & High Gain Channel V3 - Final Gain Stage for American & British Channel, Third Gain Stage for High Gain Channel V4 - Final Gain Stage for High Gain Channel, Effects Loop, & Reverb V5 - Phase Inverter Now for the question/problem: The second ("British") channel is seriously compressed sounding -- to the point that tapping on the body or bridge is almost the same volume as hitting an open chord. Any suggestions? Thanks!