Vintage VW Emden factory radio upgrade (FM Stereo, Aux line in, 4 channel)

This video is a quick show how of what is currently possible to upgrade a factory car radio from the 70s back to the oldest 40s tube radios. The outer appearence is not altered, but inside a lot gets changed. The original receiver and amp are removed and a purpose built miniature new stereo receiver/ amp combo is installed, utilising the existing controls the radio came with from factory.