Hi Team,
Long story short, I am using TINA-TI to simulate the "push-pull" output stage of a vacuum tube amplifier. I have built the .SUBCKT models for the 6BQ5 pentodes using characterized data measured from real tubes.
My problem is that using the default analysis parameters, under certain conditions, the transient analysis gets "stuck" or doesn't converge. This is more a question of what is causing an error in my transient analysis results and sometimes causes a convergence problem.
Attached is my simulation file: 5756.TubeAmp.TSC
The problem I am observing is that when I increase input size to the point that the output waveform becomes distorted due to the tubes characteristics being "overdriven" ("Vinput" = 6Vpeak or 12 Vpp), a 30msec transient analysis gets halted at 10% or 2.88msec.
If I decrease the input amplitude to 4Vpeak or 8Vpp, the transient analysis gets stuck at 3% and shows the "Convergence problem. Check the analysis parameters!"
However, if I decrease the input amplitude to 3Vpeak or 6Vpp, the transient analysis is able to converge and runs as expected.
Also included below are my default Analysis Parameters I am using. Any advice for how to adjust them if that is incase the solution?
Please advise on what is causing this convergence issue/pausing through simulation behavior. Thanks.
