Size 48 × 40mm. Exquisite FR4 double-sided glass board, Shen Jin high-quality PCB board. Thickness 2mm, thick plate is not easy to deform. Components Pitch, Pitch Pitch, Foot hole size, such as design, suitable for the size of power resistors, capacitors, tube seat and other components of the installation. Components can be double-sided assembly welding, up and down alignment arbitrary. Universal board can be equipped with a small 7-pin or a small 9-pin tube seat, versatility. Large 8-pin tube base for the flat foot hole and round foot hole with two design, flat foot for universal tube seat, round foot hole for CMC and other high-end Teflon or ceramic bakelite tube seat. Applicable to all kinds of tube lines. Package Included: 1 x Universal prototyping PCB for tube amplifiers