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RE: Choke loaded CF

As a general rule, the inductive reactance needs to be five to 10 times the operating impedance of the circuit at the lowest frequency of interest. In the case of a CF, operating impedance is determined by the output Z of the tube. As an example, if the output Z of the tube is 300 ohms, XL should be roughly 3K ohms at 20 Hz. That can be accomplished with a 25H choke. In addition to plate chokes, it's possible to use the primary of inexpensive SE transformers for this. You only need to ascertain the inductance of the winding. As for the total resistance needed to bias the circuit, bypass the cold end of the choke to ground with a good quality capacitor, then add enough resistance in series with the cold end of the choke to equal the desired value.

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  • RE: Choke loaded CF - Triode_Kingdom 08:14:19 03/07/17 (0)


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