Might be worth looking at the preamp/ di pedals out there
not only a di but a useful solution if your rig dies mid gig,
or if you want to do what geddy used to do and totally
discard the big amp in favour of a sansamp pre/di.
Leading candidates are mxr m80, sansamp bddi, aguilar
tone hammer, hartke vxl and the behringer knock offs.