Лампа PC88 RFT

HF triode designed for the front end RF amplifier in Band IV and Band V television tuners. Mullard describe the PC88 as: a UHF frame-grid grounded grid amplifier triode.
The construction is planar. The flattened cathode has a frame grid surrounding it. Even under magnification the grid appears as a film with no wire strands visible. Beyond the grid is a square U channel anode with its flat end to the grid. The approach to a minimizing the lead inductance is to use multiple pins for the grid connection. The relatively high anode current was employed to reduce noise.
Mullard designed a UHF TV tuner around the PC88 operated as a grounded grid amplifier and a PC86 self oscillating mixer.