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RE: CCS with Cathode Resistor in a long tail ?

If you wanted to use plate load CCSs and a common cathode CCS (connected to a negative voltage PS), one or the other of the current sources will not be serving as a current source as they can't be set so that the plate and cathode current values are exactly equal. If place a 100K resistor from the plate of each tube to ground, then the current through the input stage is the sum of those through the tubes and those through the resistors, but the current through the common cathode CCS is only the sum of the tube currents. You can then adjust the plate current sources so that the current through the 100K resistors sets the plate voltages. To make this clear I will have to devise a schematic with the details. It may not come soon, but I will try.


Kevin Carter
K&K Audio
www.kandkaudio.com

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