Tung-Sol is a brand owned by the American New Sensor Corporation and manufactured at the Xpo-Pul - Reflektor factory in Saratov, Russia. The Tung-Sol 5881 beam power tetrode tube is electrically equivalent to the 6L6 tube except that the plate and screen dissipation ratings have been increased by approximately 20%. Rugged and reliable it embodies a mechanical redesign resulting in greater shock and vibration resistance. These are impressive tubes and deliver everything from classic deep lows, to clean highs. It is a high quality option for use in the most demanding vintage and modern guitar amplifier circuits. It is rated for up to 400V plate voltage.
Important - whilst very tolerant with regards to biasing, it is essential to rebias any tube amp fitted with 5881 tubes, targetting 50% - 70% of the rated maximum 23W rating in order to ensure optimal tube life. This will also provide vintage tone with slightly less clean headroom.
Open datasheet - 5881
