This TCS12 has been refurbished with the Receiver, Transmitter and Power supply as close to their original state and performance as possible with minimal component changes. It is mostly used on CW. As it's receiver bandwidth is about 10 kHz wide, very good for honing ones CW skills, it is mostly used with another receiver (Eddystones 888A or EA12). It came with its antenna loading coil but that has not been used. It took the gutting of another receiver and two transmitters to obtain the parts to bring this set back to good working order.