The dual-beam crt gun structure ussed in the 7844 is featured on the coverpage of this installation of Tekscope. Contents include a 400-MHz dual-beam oscilloscope, the oscilloscope with the digital multimeter, Op amp bandwidth approximations using the 577/178, and troubleshooting the 7B70 and 7B71 time bases. Photographs, graphic representations and block diagrams are also in evidence.