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Original Message
RE: Grid Stopper Resistors.
Posted by Paul Joppa on January 8, 2017 at 08:39:57:
High transconductance, not voltage gain (mu), is what drives oscillation risk.
In my experience, 1-2mA/v rarely needs a grid stopper, 5mA/v (like a 2A3) definitely needs one, and over 10mA/v may need more than just a grid stopper.