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Re: Where does noise appear on a resistor?

Posted by Russ57 on January 20, 2004 at 08:58:43:
Okay, it would help if I knew what amp your were talking about. But, from your description, I am guessing we are talking about a grid stopper and a grid leak resistor. The grid stopper would go from coupling cap to the grid of the output tube. If that is what you have it is best for it to be a carbon comp resistor it is vital that it's lead be pulled up tight to the output tubes socket. The grid leak resistor should go from grid of output tube to ground. You may use whatever type resistor you like. What's important is tight matching of all of these resistors. For that reason I would use a quality metal film of 1% or better yet, 0.1% tolerance. These resistors aren't a voltage divider. The grid stopper controls any tendenancy towards high Hz oscillations. It's a safety thing in effect and might not be necessary but is good engineering practice. The grid leak resistor loads the previous tube.

Russ