Re: Grid coupling Capacitor aka "That" cap.
Bear in mind that 'that cap' does no harm in some valve sets, where the output pentode is driven straight from the detector e.g. Pye P45. It would have to be very leaky to have much effect, and even if there is no other DC block the detector output is negative so will have the opposite effect of the usual circuit.
Personally, I don't like the term 'that cap' and had never heard it before coming to this site.
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