The unit can be operated with various sources and produces a clean full range audio sound when connected to a audio line level (even at extremely low levels) or speaker level source. These are great for individuals to use with their antique radios both here in this country and for export to other countries and overseas.The Broadcaster makes it possible for owners to listen to their favorite music or programs wirelessly and is especially usefull for radios that do not have a separate audio input to use. It has two controls: Off/On Volume - to turn the unit on and adjust the level to match the sound source that it is connected to and Tuning - to select a frequency for the radio to receive the signal. It includes an audio cable with two male RCA phono type connectors for mono or stereo sources and can be adapted where necessary. The unit has a polarized power cord and power transformer for safety, built from more than 65 new and NOS parts and incorporating four stages - three tube based in operation using a shunt feed Hartley oscillator, modulator, carrier control and output amplifier. The item "AM BROADCASTER TRANSMITTER HEAR YOUR MUSIC ON ANTIQUE AIRLINE PHILCO RCA ZENITH" is in sale since Friday, May 12, 2017. This item is in the category "Collectibles\Radio, Phonograph, TV, Phone\Radios\Tube Radios\1930-49".wart" and is located in Seattle, Washington. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Russian federation, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica.