The TT100 is a beam tetrode with a 100 Watt anode dissipation. The TT100 is an RF device for use in Class C amplifiers, but can also be used for linear amplifiers and audio.
The anode is unbroken and the internal electrodes are not visible.
Close inspection reveals a pair of cathode and grid assemblies built within a single anode. The latter is connected to the top cap with four straps.
The anode connection to the top cap is four straps each set at right angles to one another.
The TT100 has a 12 pin base and a centre tapped heater. With power applied to pins 1 and 12 the heater takes 12.6 Volts at 1.6 Amps. The anode dissipation is 100 Watts and the screen can dissipate up to 10 Watts. The cathode current has a maximum peak value of 2,000 mA. To improve the frequency of operation several pins are used for critical electrodes.
The TT100 came with a slide-on set of heat sinking fins. The outside diameter is 100 mm and it is 69 mm tall.
The wide glass tube envelope is 77 mm in diameter, and excluding the base pins is 111 mm tall.
Reference: Jeremy Harmer. Type TT100 was first introduced in 1970.