Powering the GRC-9 and similar radios can be difficult.
I purchase old  12VDC GE Exec radios at hamfests and use them as a basis for solid state  power supplies. The GE's  have large power transistors and are all most bullet proof.  Cheep.  And they are light weight and portable.
A single power supply can be used for the GRC-9, BC-1306, GR-109 RS-6 etc.
K4che