We have developed a high efficiency, wide bandpass solenoid spectrometer for the detection of electrons between 1 and 20 keV. The apparatus utilizes baffles to impose minimum and maximum constraints ofthe radii of electron trajectories, and therefore on the component of their momentum perpendicular to the magnetic field. Electric fields parallel to the magnetic field and time-of-flight information are used to contrain the electron's momentum component along the magnetic axis. A microchannel plate detects the electrons with high efficiency and provides fast timing. The performance of the apparatus was studied through a comparison between binary encounter approximation (BEA) calculations and measurements of δ-electron emmission in 5 MeV proton collisions with thin solid carbon targets.