The PCF806 is a triode and frame-grid pentode frequency changer for VHF television receivers up to 220 MHz. The company describes this type as exclusive to them.
The local oscillator is based on the triode and the mixer is the pentode. The heater rating is precise and so can be used both in series or parallel configurations.
The triode local oscillator is on the right with the mixer on the left.
This valve is new old stock but the vacuum has been lost and the getter turned milky. The base shows the break - a crack across the hard glass base.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 42 mm tall.
