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Can anyone identify this anomaly at the start and end of this waveform?

As I start to lower the source frequency below ~500Hz I am starting to notice a voltage offset. The swing seems to be fine at first, but as I go lower the relative short rise of the first swing, seems to coincide with a bit of an extra swing at the end of the waveform. It does start to compress the first swing a bit at lower frequencies.

I think I have isolated it to tye 6J5 area. My 6J5 model is not be great, I guess I could figure out how to use a 6SN7 model to try in place, thought I would ask first.

Does this have something to do with the influence from the plate choke on the 6J5? (Paul Joppa specified a 150H hammond (159H would be 20Hz -3db)) I tried playing around with the values a bit, it doesn't seem to correct much so I am not sure.

I am not going to get too excited about it, just wondering if I am seeing this correctly or if it's due to an obvious simulation error.

Below is my current schematic and a screen shot of the 6J5 plate connection.








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