Features

• It is a product from the vacuum tube era that old fans miss, but it is still in ***. Before the widespread *** of printed circuit boards, it was a typical style to assemble resistors and condensers in an orderly manner, draw out cladding wires, and connect them to vacuum tube sockets. Even in the age of transistors, it has been ***d to construct experimental circuits for beginners beca*** of its large structure and easy soldering.