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In Reply to: RE: 417A linestage posted by Tubenstein on January 22, 2016 at 10:42:12
Too much! There's no grid resistor to provide bias....
Follow Ups:
This is my friend told me: "the grid resistor is a given as this circuit will always have a volume control which becomes the grid leak, if grid leak was shown it would only be paralled to a volume control and it's resistance would then be the combination of both."
You have a tube with a mu of 43 and a plate resistor of 2.5K which will throttle it back. You are putting on the gas and the brake at the same time. You could run the tube through a step-down interstage and not waste all the great current.If you want to know the current, just measure the voltage at the cathode and use Ohms law. If it is just a design wire it up with a 500 ohm cathode resistor and work down to get your desired operating point.
Edits: 01/22/16
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