Before revision: BC (medium wave/"AM") only radios like the "All American 5" design, and later AM/FM radios with more tubes, and even televisions were build using the same idea, because of the simplicity and low cost possible.
After revision: BC (medium wave/"AM") only radios like the "All American 5" design, and later AM/FM radios with more tubes, and even televisions were built using the same idea, because of the simplicity and low cost possible.