Offered are (2) 6A8G and (1) 6A8GT Pentagrid Converter Tubes by National Union. The tubes are clean and in good condition. Each tests Good on the EICO dynamic tester and they show no shorts. The tubes have grey smoked glass interiors and pewter ribbed plates. Each has a lower/side getter with all good silver flashing. Date codes printed are as follows: CR, G and CR. The 6A8GT tube has a tin base with a few cracks. Used in radios of the 1930's by many manufacturers. Pick up these three for your own radio work upcoming. Mouse over the photo images to zoom in.  NO RESERVE!! Thanks for looking.