I had a Mesa.studio preamp USA model (115v) and my technician rewired the internal transformer to use it in European voltage (230v)...it is a very simple modification.
Killer
.. I'm waiting for the day to come and Henric will modify my jmp 3gs.
.posts like this don't help...lol !!
Do you have a 3GS too?
Is there a big difference in tone?