first introduced in 1933, the "volksempfänger" model ve301 used a tuned radio frequency (trf) circuit, an economical radio receiver design common during the 1920s. the radio set was capable of reception on two bands: "lange welle" (long wave) from 150-350 kilohertz, and "mittel welle" (medium wave) from 550-1700 kilohertz. the glass tuning dial was imprinted with the names of german and austrian cities corresponding to the frequencies of broadcast stations located in them. the set employed three vacuum tubes: rgn 1064, res 164, and af7. three different ve301 models were produced to suit differing power supply requirements: batteries, alternating current (ac) mains, or direct current (dc) mains. variations in ac line current were accommodated by moving a wire on the power transformer to select 110 volt, 130 volt, or 220 volt current. three antenna jacks were provided for antennas of differing lengths, used to optimize reception on the different frequency bands. "volksempfänger" models produced between 1933-1937 used an inexpensive metal reed type speaker. the 1938 models (ve301 dyn) added an audio output transformer and featured a more modern electrodynamic loudspeaker.