Just got my mic transformers and new cables now I need a y adapter to run it to the jb3. I've got a 2 x 1/4 (stereo) to a 1/8 stereo y adapter and it only gets one channel, don't know why. I couldn't find 2 x 1/4 (mono) to a 1/8 stereo y adapter at the shack, anyone know where I could get one.