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Parafeed PP with current source on joined cathodes

Posted by ChasLieb (A) on March 21, 2007 at 20:44:42

I'm designing an amp of this configuration and want to use plate chokes but am not sure if this would conflict somehow with the current source on the cathodes. I have been told in the past that if I use a current source on the plates I cannot use one on the cathode as they will interact. Many call the choke a current source and I want to make sure this design will work. The current source on the cathodes would force the circuit to act differentially. I am using a tube that needs minimal voltage - 110v, but higher current - 125ma, and want to use plate chokes rather than resistors. Must go parafeed as the tranny cannot take the current. Just checking to see if anyone can think of a reason this would not work. Thinking about Mikey's 100ma plate chokes as the voltage is so low they should probably take the 125ma current. Also seeking guidance on whether a cap is needed on the center tap of the primary to ground and if so, how to calculate its value. Anyone?

C.

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