I had the 115 version of your rig and simply swapped out the [color=#282828][font=helvetica, arial, sans-serif] Ampeg Portafex PF-500 for the 50T. It's a great rig but made better with the all tube head. [/font][/color]
[color=#282828][font=helvetica, arial, sans-serif]It isn't clear reading this why you want to change, beyond having some cash to put into it? The Portaflex stuff is good standard stuff and if you like it...[/font][/color]