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Re: What is the role of the gate stopper on the mosfet CCS?

Posted by KevinC (M) on September 18, 2006 at 06:15:37

In Reply to: What is the role of the gate stopper on the mosfet CCS? posted by Francois Robichaud on September 17, 2006 at 19:33:23:

The role of the gate resistor is to provide what is essentially a roll-off filter at very high frequencies to prevent oscillation at high frequencies.

Your problem is that something is "opening up" so no current flows through the tube stage and, therefore, no current is flowing through plate resistors. This causes the plates to be at B+. I would look for a component or solder joint that creates an open circuit when it warms up a bit after turn-on. The CCS and the tube filament are the only parts that are common to both halves of the tube, so they are the place to look.

Kevin Carter
K&K Audio
www.kandkaudio.com

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