Acquired yesterday. Hallicrafters S-40, but 'm not sure if it's an S-40, S-40A or S-40B. Obviously someone has done a paint job and the model number vanished. Serial number HA-75854. Needs a good cleaning, and technical revision. Works intermitently. I'll be searching for all the info I can and all and every single help and/or advice would be much appreciated. When put back to work it will a "crown jewel" in my QTH!!