Categories Motorola Plaskon Motorola 57A Post author By radioguy Post date June 15, 2015 Year: 1957 Initial Issues: Works, slight hum and three cracks in the case Repairs: Re-solder bad connection of output tube, replace leaky 50C5 output tube, glue cracks and fill with Bondo and paint to bright red Before pic Purchased May 19, 2015 ← General Electric Model 123 → Arvin 35R48