Nonode

A nonode is a type of thermionic valve that has nine active electrodes. The term most commonly applies to a seven-grid vacuum tube, also sometimes called an enneode. An example was the EQ80/UQ80, which was used as an FM quadrature detector.^[1] It was developed during the introduction of TV and FM radio and delivered an output voltage large enough to directly drive an end pentode while still allowing for some negative feedback. As most of the grids were tied together, even an 8-pin Rimlock base was sufficient in the case of the EQ40.

References

↑ Schindler, Patrik. "EQ80 Enneode". Electron Tube Data sheets: pp. 413–422. https://frank.pocnet.net/sheets/046/e/EQ80.pdf.

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[1] Schindler, Patrik. "EQ80 Enneode". Electron Tube Data sheets: pp. 413–422. https://frank.pocnet.net/sheets/046/e/EQ80.pdf.

[1]

v t e Thermionic valves
Theoretical principles	Thermionic emission Work function Hot cathode Space charge Control grid Suppressor grid Anode Glowing anode Getter
Types	Diode Audion Triode Acorn tube Nuvistor Tetrode Beam tetrode Pentode Pentagrid (Hexode, Heptode, Octode) Nonode Cathode ray tube Additron Backward-wave oscillator Beam deflection tube Charactron Compactron Eidophor Iconoscope Inductive output tube Kinescope Klystron Magic eye Magnetron Monoscope Phototube Photomultiplier Selectron tube Storage tube Sutton tube Talaria projector Traveling-wave tube Trochotron Video camera tube Williams tube Fleming valve
Numbering systems	RMA RETMA Marconi-Osram Mullard–Philips JIS Russian
Examples	List of vacuum tubes List of tube sockets

Nonode

Topic: Engineering

See also

References