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Re: Grid choke and optimum coupling cap value

Hi Thorsten

Would I be correct in saying that as the coupling cap and the choke form a series resonant tank circuit there would be attenuation (pass filter) of the signal at and around the resonant frequency?

If the cap and the choke formed a parallel resonant tank circuit there would be rejection of the signal at resonant frequency (trap)?

In the latter case I would expect to see slight a rise in response at the resonant frequency, which is I think what you are suggesting.

I think I will increase the cap value to .32uf by adding a 0.1uf russian teflon cap across the .22 pio I have in there. I also have another pair of 640H chokes on the way to me, so I may try adding another in series to give me 1280H. I think I would be correct in saying that this would be better than making the cap bigger

Also what would be a suitable damping resistor to put across the choke? 1M ohm?

Thanks

Martin

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