``Line art'' gif of a schematic diagram of the ``All American'' five-tube ``AC/DC'' AM radio receiver. [``AC/DC'' here does not refer to the heavy metal band Butthead likes, but rather it means ``hot chassis.''] Virtually all AM radio manufacturers used this exact circuit from about 1948 to 1963 or so. People are starting to collect these radios as antiques of sorts. [I would be happy to credit the creator of this figure and caption, but I don't recall from where I down-loaded this. If you made it or know who did, please give me an electronic holler.]