I have a few friends that have the skill to replace the parts if they go.. Is there something that is known to go bad in this amplifier?I have the exact same amp, bought from GigaParts a few years ago on sale for $209. I use it with an Elecraft KX3 with 2m option for SSB where the KX3 puts out 3w and the Mirage B-310-G does well over 100w. Or at least it did for awhile then burned up the PA transistor right out of warranty. I never abused the amplifier and it was always run into a near perfect match.
Fortunately I had a more rugged replacement transistor laying around and after installing it I carefully tuned the amp for max power and least amount of current draw. I tested the amp with 5w input keyed down for very long periods of time plus ran it without an antenna to make sure it was going to last and so far its holding up fine. If this happens to you and you don't have the skills and parts to repair the amp it will become an expensive paper weight.