Knight Stereo Integrated Amplifier For Repair Needs Tubes. The item "Vintage Knight KG-250 Stereo Integrated Amplifier For Repair Needs Tubes" is in sale since Friday, April 2, 2021. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps". The seller is "greengirl613" and is located in Matawan, New Jersey. This item can be shipped worldwide.