Tube DIY Asylum

RE: Sample Sine Wave

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It may be my equipment or the operator, but I am having a hard time getting a sine wave like that. Here's what I have been able to get so far. It's kind of weird because it has no flattening at just before 1/2 volume (bottom phot 1.95 vac), starts to flatten out at about 1/2 volume (2.3 vac, middle photo) and the flattens more as you increase volume until you get up to almost full volume when it start getting rid of the flat spot again (top pic 9.8 vac). The interesting part to me is I don't really hear any increasing distortion in the music until almost full volume. So what do you guys think?

Edits: 02/23/19   02/23/19   02/23/19   02/23/19

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