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Re: Weird results DC operating point for Tube amplifier


 

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Forgot to mention I use the alternate solver.

Le 17/02/2025 ¨¤ 19:21, Jerry Lee Marcel via groups.io a ¨¦crit?:

For me the simulation is correct.

8.6V at the LM317 input, 5.8V at the output.
Gain of about 15.

I run version x64 24.1.2

Le 17/02/2025 ¨¤ 18:00, Carlo a ¨¦crit?:
Hello,
I uploaded the project "Bravo_Ocean_ampli" in Files->Temp. As you can check the .tran analysis returns a weird DC operating point (aka ITS/Initial Transient Solution). Namely the current through R4 connected to LM317 Out pin is negative -165.5mA. Of course physically it can't be the case (note that it isn't a problem related to how R4 pins are arranged in the schematic).
?
What could actually be the problem with this circuit simulation ? Thanks.

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