I notice when I crank my amp with the Brahma mod(Preamp Locked on 11 o'clock master going pass 9 o'clock) it starts to sound a little thin...I boost it with a OD pedal...maybe I am using to much gain from the OD pedal?
Try cranking the master volume to about 3 o'clock and then going to about 9 ' oclock on the module. Crank the level on the OD to full but little to zero gain. That worked wonders for the brahma for me. Let the amp do the work for the volume and not the module. 8)
I am mixing JJE34L and Winged C EL34's. when I crack pass 9 0 clock on the master it starts to get loose and thin....I will try MailMan1971 idea but isn't better to adjust the master for overall volume and keep the level around noon?