Summary

6.3 V indirectly heated cathode, manufactured by Hygrade Sylvania Corporation, Emporium, PA, USA, 1941-1950.

The 7R7 is a double diode remote cut-off pentode designed for use in airborne and other receivers subject to shock and vibration.

The Loctal base fitted to this valve has a detent on the locating spigot which prevents the valve from coming out of its socket when subjected to vibration such as that encountered in aircraft equipment.

Physical Description

Tubular glass bulb on loctal base.

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