Anonode is a type ofthermionic valve that has nine activeelectrodes. The term most commonly applies to a seven-gridvacuum tube, also sometimes called anenneode. An example was the EQ80/UQ80, which was used as anFMquadrature detector.[1] It was developed during the introduction of TV and FM radio and delivered an output voltage large enough to directly drive an endpentode while still allowing for somenegative feedback. As most of the grids were tied together, even an 8-pin Rimlock base was sufficient in the case of the EQ40.[citation needed]
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