Tubes are a type of vacuum tube made of glass or metal containing a narrow gap containing a gas that allows an electric current to flow between two electrodes. 10BQ5 is a type of tube made by the company RCA. It is a small, lightweight power pentode intended for use in AC-DC and audio power amplifiers, as well as other circuits. This type of tube is known for its high gain, low distortion, and warmth when compared to other types of tubes.