Quote Originally Posted by Oby View Post
Another idea totally away from valves just to confuse you. A friend of mine has a drop-in tone control pot from Guitar Fetish which is a pre-amp and effect unit all contained on a tiny circuit board on the back of the pot. It was very nice playing through headphones plugged directly into the guitar. You can get them with different effect built-in too.
Can you switch it off easily to play normally through an amp? It reminds me of the AmPlug, which is a convenient option for headphone practice. I have never tried one so can't comment on the sound.