Diode sections used for signal detection and AVC rectification, triode section used for the first stage of audio amplification in radios. 6.3 volt indirectly heated cathode. Used as a Class A amplifier.

This valve is an example of metal-glass construction where a glass valve was fitted with a close fitting metal jacket. They were produced for a short time from 1936 to compete with the newly released metal valves by manufacturers who did not want to tool up for all-metal production.

Physical Description

Metal sheathed valve sectioned to show the conventional glass internal structure. It has a top cap and octal base with 7 pins present. Painted black. Mounted on display block.

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