3TACG5

3TACG5 is a designation that refers to a specific type of electron tube, often found in vintage audio equipment, particularly vacuum tube amplifiers. It is a beam power tetrode, meaning it has four active electrodes: a control grid, a screen grid, a suppressor grid, and an anode (plate). The "beam" in beam power tetrode refers to the design that focuses the electron flow into beams, which helps to reduce secondary emission and improve efficiency.

This particular tube type gained popularity in the mid-20th century for its ability to produce a relatively high output power with good linearity compared to earlier tube designs. Its robust construction and characteristic sound made it a favorite for many amplifier manufacturers. The 3TACG5 is known for its warm, rich tone, which is often sought after by audiophiles and musicians. While no longer in mass production, these tubes can still be found in older equipment or sourced from specialized suppliers. Replacement and maintenance of such tubes require careful handling and knowledge of vacuum tube technology.