On Wed, Mar 5, 2025 at 08:31 AM, Andy I wrote:
It's been ages since I checked on that.? But it might be the option ITL1 = 100.
For the tube amplifier schematic, ITS step takes 44 Direct NR iterations (totiter=44) to converge with default settings.
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I tried to set .option ITL1=10 for .tran 0 10m analysis just to check that after the 10th iteration Direct NR gives up and switches to gmin stepping.
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However, it looks like this is not actually the case though.
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I asked also this on . ITL1 assigned value less than 100 (default) is actually ignored.
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Carlo.
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Carlo