The CV9850 (commercially the YL1080) is a quick heating version of the QQV03-10 VHF transmitting double tetrode. This exhibit was made by Philips in Holland but branded Mullard. The stylised logo indicates manufacture post 1970.
This valve is designed to operate in the VHF frequency range 67-200 MHz. Designed for oscillator, multiplier or PA service it was planned that this valve would operate in class C. The anode dissipation is 4 Watts per anode and an RF output power of up to 12 Watts was possible.
The strong springs that keep the filament in tension. There is one on each side as there are two filament loops.
The thin anode plates to either side of the central beam plate. The screen grid is common to both sections and within are two single sided control grids.
The sides of the anodes are folded to add rigidity. The grids are wound on copper supports.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 70 mm tall.
