Voltage converter for battery operated tube radio receivers / transceivers. Solution to the problem of mobile use. Allows for mobile operation of vintage DC operated radios from a single 12V battery. This is a battery consolidator providing multiple voltages from a single DC source. It also becomes a battery eliminator when powered by an AC/DC adapter (also available). Converts 11 – 30VDC (Vin) to necessarily filament, plate, and grid voltages. “A” (filament) supply : “Ax”: 1.25V to 10V / 3 amp, “B” (plate) supplies: 135V/ 80mA, 90V/ 60mA, 67.5V /45mA, 45 and 22.5V/ 5mA, sum of all “B” supplies. B-, A- and Vin(-) are common in this converter. It CAN NOT BE USED to power farm radios using 1.5 and 90V batteries. Radios requiring B- to be connected to A+ will operate with B-connected to A- but with slightly reduced plate voltages. DC input can be supplied by battery (see photo, battery not included) or appropriately sized linear AC / DC adapter (see photo, adapter not included). Two indicators: one indicates battery is connected and voltage converter is ON, the other indicates radio is also ON and drawing current. Small size (4.7 x 4.7 x 4″ height) with cover on (3″ height with cover off). Light weight 18 oz. Without battery or adapter. DC in: 11 – 30V. Operating temperature 0-35 deg C. Contains input and output EMI filters. Overload, short circuit and reverse polarity protected. Converters can be connected in series to provide higher “B+” voltages: 157.5, 180, 202.5, 225 or 270V (247.5V can also be provided with series connection and simple adjustment). Series connection requires two converters and two batteries or AC/DC adapters.