Seller: mrozarka (2,166) 100%, Location: Augusta, Georgia, Ships to: US, Item: 202773654612 The J117 was developed by Dr. H.P. Donle of the Connecticut Telephone and Electric Co. of Meriden, Ct. The circuit is shown on the attached photograph.The filament operated from a 6 volt DC source and was insensitive to changes. The tube was surrounded by a coil through which a direct current flowed, setting up a field parallel to the tube. The arrangement was difficult to tune and many of the Sodion sets were returned. Filament is good. Payment is by Pay Pal and shipping is by Fed Ex Ground or Home Delivery at $12.00 anywhere in the lower 48 States, insurance included. No foreign shipping.