We have not thoroughly tested. Just powered it up. Sold as is! The Vintage Cerwin Vega M-200 Amplifier is a classic piece of audio equipment from the renowned brand Cerwin-Vega. Known for its high-quality sound and vintage appeal, this amplifier comes with vu meters for added monitoring and control. Perfect for audiophiles and collectors of vintage audio equipment, the Cerwin Vega M-200 offers a retro feel with modern functionality, making it a standout piece for any audio setup.