Curtis mathes stereo question

[TranStar]

i have a curtis mathes solid state stereo with a AM/FM radio, a 4 speed turntable, and an 8 track player. the issue with it is through the main speakers the audio comes out normally for a split second when you change between a source but then goes mute. although the headphone jack works but you have to turn the audio up ALL the way to hear anything. also the volume control cracks loudly when adjusted.