test jig design for power amplifier

please help how to design test jig for power amplifier my requirement is to give 28v for 4 pa's connected in series and -5v to its gate,how can i provide the same 28v supply to all the driver stages of power amplifier,i will take power supply of higher amps but how to design a test jig so, that i can give same 28v power supply to all drivers of power amplifier.

There are many variables to building a usable test fixture. Frequency, power (10s or 100s of watts), temperature, important characteristics, etc.