Universal test choke for substituting field power supply choke coil in old radio's using electro dynamic speakers. taps for 250,500,750,1000,1500,2000,2250,2500,3000 Ohms  DC   40-60mA continuous  50-75mA intermittent duty

New old stock in original box, clear taped together, instruction sheet, coil tested OK using Ohmmeter