[quote name='Dad3353' timestamp='1423679338' post='2687894']
That, in essence, is what the FOH PA does. All that's needed is the low-power valve power amp. There are 5w amps out there; no good with a DI out to FOH..?
[/quote]
The only way that would work is if you mic up the cab. The DI from most valve amps comes out before the power stage, and it's the valve power stage that gives the valve amp its uniqueness.