ID: 
542
Maker's Name: 
AWV
Where made: 
Australia
Dimensions: 
2.2 × 2.2 × 5 cm

This valve was used in turret tuners of black and white TV receivers. It was the RF stage, the triodes forming a cascode configuration.

The first triode is the input amplifier stage, grid driven, and is low impedance input, typically 300 Ohms.

The first triode then cathode drives the second triode, which provides both power amplification and a high impedance output.