The 30P12 beam tetrode was designed as a single ended audio amplifier output valve for television receiver use or as a TV frame scan output valve.
To operate successfully on the low anode voltage available in a TV receiver the valve has to operate at higher current to achieve the target output power of around 2 Watts.
The side of the anode and above the top mica is the heat radiating fin attached to the copper supports of the control grid.
Made in England. The grid heat sink stops short of the top mica.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 67 mm tall.
References: Data-sheet & 1040 Type 30P12 was first introduced in 1958. See also1958 adverts.
