Acoustic 370 add power amp in

[binito]

Hello,
I have a Acoustic 370 and i´d like to add an input of power amp in.
I want to use one Sansamp as a preamp and connect directly to the PA of acoustic 370.
Attached a schematic with mod that i think . I´m not sure i´m doing it right.

[J M Fahey]

Yes, it´s fine.