Please review to all pictures. It has been refinished and the wood apears to be of walnut and looks very nice. Lid works as it should, The knobes move all gadges freely thanks. United States of America (USA). Broadcast Receiver – or past WW2 Tuner. TRF without regeneration; 2 AF stage(s); Neutrodyne. Power type and voltage. Storage and/or dry batteries / “A” battery 6V, “B” battery 2 x 45V, “C” battery 4.5 Volt. This model requires external speaker(s). Tablemodel, Box – most often with Lid (NOT slant panel). 21 x 10.375 x 11 inch / 533 x 264 x 279 mm. The Sparton model 5-15 is a set of the first radio season for Sparks-Withington Co. The Sparton slogan was: “The Pathfinder of the Air”. See also the article here about different radio seasons. By removing wire jumpers, the radio can accommodate a power tube 112A in the output stage – or the. 171A tube, with additional bias voltage (using a 2nd 4.5V “C” battery for a -9V grid voltage) and higher anode voltage (using more “B” batteries for plate voltages of 135 or 180 volts). The start of production for this model was in December 1925, but first sale activity was in 1926. Sparton Radio Service Manual. For this model (Manual 1, Bulletin 1) is dated June 1, 1936 and calls for the use of 01-A tubes, which are the much later dome shaped tubes, not the original tube line up! The list “The quantity and types of tubes used in Sparton receiving sets” from 1937 or later also names the tubes used as 01-A. Sparton tubes were most likely used in this model while it was in production, but by the time the Sparton Radio Service Manual was published in 1936, radio manufacturers were using the more generic “01-A” tube nomenclature. Suspect that the original tube lineup was: C-201A C-201A C-201A C-201A C-201A or C-112A, however no documentation has yet been found that actually lists the original tube lineup.
