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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: update posted by vinnie2 on October 19, 2016 at 08:40:24:
that might help you understand. If the tube and operating point were perfect then the output current and output voltage would be symmetrical just like the input signal but their not. One side is larger than the other. That's harmonic distortion.It's caused by the spacing between the grid lines not being even along the load line. The lines to the right of the idle point are closer together than the lines to the left of the idle point.
If you want linearity (low distortion) you want to look for even spacing between the grid lines along the load line.
Most tubes have grid lines that are close together to the right and further apart to the left. Only a few tube have grid line spacing that is even all the way across.
A 6sn7 at 200 volts plate and 14ma idle current is pretty linear.
The 45, 2a3, 300b, 845 and 211 are pretty linear.
A 12au7 is not. The grid line spacing starts wide on the left and get narrower and narrower and narrower all the way across and there is no area where the spacing is even.
Tre'
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"Still Working the Problem"
Edits: 10/19/16 10/19/16 10/19/16
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Follow Ups
- a graph.... - Tre' 12:54:01 10/19/16 (9)
- RE: a graph.... - vinnie2 13:22:50 10/19/16 (8)
- RE: a graph.... - Tre' 13:36:49 10/19/16 (7)
- RE: a graph.... - vinnie2 16:58:52 10/19/16 (6)
- Ditto vinnie. Thanx Tre! Info saved. - 91derlust 02:28:37 10/20/16 (4)
- Here's a helpful PDF - Tre' 09:59:13 10/20/16 (3)
- RE: Here's a helpful PDF - 91derlust 12:38:58 10/20/16 (2)
- RE: Here's a helpful PDF - vinnie2 12:54:30 10/20/16 (1)
- Yes. I!m with ya vinnie! (nt) - 91derlust 02:17:39 10/21/16 (0)
- RE: a graph.... - Tre' 17:06:11 10/19/16 (0)
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