An RFQ has replaced the 750 keV Cockcroft‐Walton as the H−preinjector for the AGS. A magnetron surface‐plasma source with a circular aperture is used to produce 65–100 mA of H−at 35 keV with a discharge current of less than 20 A. The circular symmetry of the beam is maintained in the 2 m transport to the RFQ via the use of magnetic solenoids for focusing. Currents of up to 60 mA have been obtained out of the RFQ.