The EBF89 features two signal diodes and a variable Î¼ pentode in the one envelope and sharing a common cathode. The diode anodes are small plates placed either side of an extended cathode tube. The variable Î¼ characteristic is indicative of a device designed to have its gain controlled by an AGC system. This places this valve in service as a final IF amplifier and detector. The high impedance of the pentode supports the case for use with a tuned circuit connected to the anode. The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 57 mm tall.
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