11LT8 is a pentode tube used in some radios and other electronic devices. It is a low mu, and medium mu tube. It was produced by various companies such as RCA and GE. It is an indirect-heated type tube, which means its cathode is heated by a separate heating element, rather than being heated by the anode voltage as in direct heated tubes. It has an average plate current of 4.5mA, and a maximum plate voltage of 180V. It has two grids, control grid 1 and screen grid 2. It features very good low-frequency gain, and good frequency response up to 30MHz. It is typically used in audio frequency applications as a mixer, amplifier, and oscillator.