Hi I have a muskat mpx-20 stereo receiver with a dead FM section. i tried to find the schematic, but i found very few references to the brand on google. The AM section the phono input and the 8-track player are working, but the FM is almost dead. when i select FM i hear only hum, but if i put full volume and use headphones i can listen to FM, but very very quiet. i changed some caps, because the main filter cap was dented. and the other caps looked very ugly. i didn't changed all the electrolitic caps yet because is a very difficult board to work on. After changing some caps the AM reception improved a lot, but FM is still dead.