MagneQuest/Peerless Forum

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RE: First Simulation

Posted by Gordon Rankin on March 13, 2017 at 16:28:40:
Ok,

First off, remember a class a amp operates full with 0Vac input. So yes bias the 300B at 60ma. You don't need to worry about the AC-PP current as that is not an issue. Remember class A 0Vac input is when the tube is running at max power.

Second if you are doing a simulation you need a ton more data. Remember the Rp of the tube effects the results as it is in a sense in parallel to the tube.

Also remember when approaching 60% of the bias voltage in an AC input signal to the 300B that the grid will start to draw DC current which will increase the voltage across the grid resistor and rebias the tube.

You do know that your going to need a boat load more AC voltage input to the 300B. Looks like your gain tube is going to result in like 18Vacrms gain and the 300B is going to need 51.63Vacrms into the 300B to get to 8W's. That means you need about 3Vacrms input to make that work.

Also work in voltage, tubes are voltage devices, working in current is just going to confuse you.

Thanks,
Gordon