Use the proper value of C-battery as determined from your study of the characteristic of the tube.
Usually, therefore, we arrange to shift the characteristic by using a C-battery.
Choose your C-battery for amplification and not detection and try to receive.
What effect is this C-battery, or grid-battery, going to have on the current in the plate circuit?
As long as we do not use a higher voltage than 188that of the C-battery which is in the box no current can flow.
