MagneQuest/Peerless Forum

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RE: Q to John Swenson or others about Transconductance amp..

Posted by John Swenson on October 23, 2007 at 15:30:49:
The CCS will run the cathode at whatever voltage is necessary to maintain the current through the tube. As long as the B+ is high enough so the output tube can maintain that current with a negative grid, it will do so.

If you have built one and the grid to cathode voltage i sclose to zero or positive, that probably means the screen voltage is too low. There is a voltage divider feeding the screen, you can change the screen voltage by changing the resistor values. This needs to be done so the grid has enough voltage range for the current swings you are trying to achieve.

John S.