If your ubitx has one of the questionable audio amplifier ICs I would be wary of using a voltage higher than about 12.5.
Most ham gear is meant to be used with "12V" supplies that give as much as 13.8V, as that is typical of the voltage in
a vehicle with a nominal 12V battery when the battery is being charged.
For my ubitx I noted I had one of the questionable audio amp ICs and rather than risk blowing it up I made sure my
nominal 12V supply was adjusted to give me no more than 12.5V. Not all power supplies provide for adjustment or
are regulated well enough not to provide excessive voltage under a light load.
73,
Al N1AW
Al Woodhull