If not - excessive heat may be build up around this resistor and that's really bad for the construction and neighboring elements.Rg1 is given as minimum and maximum value by the tube manufacturer. Rg1 is usually between 100 K to 1 M and it is also important for forming the load for the preamp-driver tube. Rg1 should be made as higher as permissible by the grid requirement of the power tube without introducing extra load on the driver tube.
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