The Vintage Tektronix 561A Tubed Oscilloscope is a classic analog oscilloscope with 4 channels, made in the United States. The oscilloscope has a digital resolution of 8-bit, providing users with a clear and detailed view of their signals. This rare and collectible piece is a valuable tool for those looking to test and analyze vintage electronic equipment. The included Type 3A6 Amplifier further enhances the capabilities of the oscilloscope, making it a sought-after item for enthusiasts and collectors alike.