I have an Icom IC-27A two meter mobile radio. I am going to be testing to see if the pot is bad, it has super low audio. To the best of my knowledge these pots can't be bought anymore. I haven't found a substitute mentioned on the web yet. I have an idea, I'm thinking of wiring in a resistor that will provide just enough audio to hear in a quiet environment and then use an external speaker that has amplification and volume control like computer speakers. I will need to get a mono to stereo plug. Does anyone know what the resistance range is of the existing pot and or have some suggestions as to what value to try first?