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RE: Voltage rating for coupling cap

Without a schematic it is speculation to give a definitive answer, but in general it should be assumed that it is necessary to use a coupling cap with a voltage rating equal to the supply voltage. Before the tube conducts there will be a voltage equal to the supply voltage on the coupling capacitor. You can check this for yourself by attaching your DVM in parallel between the plate side of the cap and ground. Power up the circuit and see how high the voltage goes before the tube conducts.

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