A signal handling stage provides variable gain, for example for automatic gain control functions, in a radio frequency tuner. The system forms a part of a network that includes storage media and playback devices, and provides an easy to use system for collection cataloging, archiving, and retrieval. The stack configuration forms the self leads of the foil winding and facilitates the winding’s exit from the coil. The wall, bottom and lid, in use, enclose an inner space comprising the extractable product.