The phrase identifies a specific type of radio receiver design. It references a circuit schematic, likely available in Portable Document Format, employing a single 1E7G vacuum tube to create a regenerative radio receiver. This type of receiver is known for its ability to amplify weak radio signals through positive feedback, achieving comparatively high sensitivity with a minimal component count.
These circuits offer a simple and educational avenue for understanding fundamental radio principles. Historically, they provided an economical means of radio reception, especially before the widespread availability of solid-state electronics. The simplicity of the design makes it attractive for hobbyists and experimenters interested in building their own radio receivers and learning about vacuum tube technology. The availability of the schematic in PDF format facilitates easy distribution and study of the circuit details.
