On the other hand, space charge was useful in some tube applications because it generates a negative car radios that required only 6 or 12 volts anode voltage ( typical examples were the 6DR8 / EBF83, 6GM8 / ECC86, 6DS8 / ECH83, 6ES6 / EF97 and 6ET6 / EF98 ).
22.
By contrast the very latest Russian manufactured tubes ( 2012 ) not only carry the same internal electrode structure as the original KT66 ( they now look the same ) they also have the same rugged electrical characteristics and can withstand a high voltage on grid 2 comparable to the anode voltage rating, allowing greater power output afforded by higher voltage capability when run in ultralinear connection.
23.
First proposed by Clement D . Child in 1911, Child's Law states that the space-charge limited current ( SCLC ) in a plane-parallel vacuum diode varies directly as the three-halves power of the anode voltage " V " " a " and inversely as the square of the distance " d " separating the cathode and the anode.
24.
A number of adaptations were needed to make such valves suitable for HVDC, in particular the use of anode voltage grading electrodes to minimise the risk of " arc-back " at the very high reverse voltages experienced in HVDC . Much of the pioneering work in this area was performed in Sweden by Dr Uno Lamm, widely considered the Father of HVDC and in whose name the IEEE introduced the Uno Lamm Award for outstanding contributions in the field of HVDC . The very long anode columns needed for high voltage applications limited the current which could safely be carried by each anode, so most mercury-arc valves for HVDC used several ( most often, four ) anode columns in parallel per valve.
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