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Signal should be heard as at B. The function of the so-called "coupling condenser" is fundamentally that of keeping the plate voltage (at B) off the grid of the following tube (at D). One point of view is that this is a "blocking" condenser since the coupling could be achieved without the condenser. However, the writer is of the opinion that when a condenser actually transfers energy between stages, the term "coupling condenser" is more descriptive.
Trouble
  
If the signal is heard at B and not at D, there is no transfer of signal between these points. This usually indicates a defective condenser. (A ground at D would ground the signal not only at D but at B also.) An open condenser will not pass a signal. A leaky or shorted condenser upsets the d.c. voltages and causes bad distoration.
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