Absolutely turn off the amp before the preamp goes off and and turn the preamp on before the amp...
I've had the UV paired with various solid state amps, and the results of turning off the preamp while the amps were on resulted in anything from triggering the protection mechanisms to blowing fuses. Not cool.
I've had the UV paired with various solid state amps, and the results of turning off the preamp while the amps were on resulted in anything from triggering the protection mechanisms to blowing fuses. Not cool.