Abstract: There is disclosed an electrically activated infrared source assembly having a frame member with a pair of substantially parallel sides adapted to receive strands of an elongated wire stretched repeatedly therebetween in a serpentine configuration, each side having a curved surface thereon adapted to receive tangentially thereto and to support thereover end portions of the wire strands stretched from the other side, the curved surface having a multiplicity of grooves therealong adapted to accept the end portions of the wire strands at the point of tangential contact for maintaining the stretched wire strands between the sides in a spaced relationship one to another, each of the curved surfaces having a plurality of projections therealong adapted to engage therearound the end portions of the wire strands.