"Tetrode Kink" is moderately explained about a third of the way down this page.
http://www.vacuumtubes.net/How_Vacuum_Tubes_Work.htm It is a problem for radio transmission, but because "negative resistance" has beneficial connotation for free energy, even if it is only "differential negative resistance" then one wonders if this "feature" can be put to use in a multi-electrode electrolysis cell. After all, "extra" electrons should be beneficial to generating hydrogen. Of special interest would be converting a Mizuno type of glow discharge electrolysis cell into a multi-electrode affair, which can benefit from not only LENR (if it is there) but also the output can be enhanced by higher levels of hydrogen generation by the redesign. A marriage made in OU-Heaven? Not quite yet - forgot to add the multipactor part to Horace's tetrode. Since secondary electron emission should be even more beneficial on the *backside* of the anode, then why not go the extra mile and expedite that with a multipactor? (of the original Farnsworth variety, not the more modern usage). The former anode now becomes a neutral plate. In the Mizuno arrangement there is a central cathode surrounded by an anode which can be a tubular wall. Now we add two grids between cathode and anode, and put the whole thing into another cylinder which becomes the real anode. With proper sealing, one could even use two types of electrolytes - for instance, a base like KOH in the tetrode gap (the "front side") and sulfuric acid on the back side. Therefore the anode would be constructed of two layers of differing work function or other emissive property (perhaps by nitriding or anodizing only one side of the (former) anode, which is now a neutral (or nearly neutral) plate. Technically this would now be considered either a pentrode, or else a tetrode in series with a diode. The two grids can be still be heterodyned or linked in some kind of resonant loop. More later, as my laptop is losing charge and this WiFi connection may not reach cyberspace anyway. Jones
