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In Reply to: RE: Null points for 7" discs? posted by flood2 on July 5, 2017 at 17:03:29:
You might want to recheck your distortion figures. I get different numbers using a 230-mm effective length tonearm.
Remember, the modulated groove envelope is in-between groove radii of 53.975-mm and 84.1375-mm. With my null-points of 56.97-mm and 77.77-mm, I calculate the following:
Average RMS Distortion = 0.108%
Peak Distortion = 0.159%
With your null-points of 53.975-mm and 76.23-mm, I calculate:
Average RMS Distortion = 0.137%
Peak Distortion in-between null-points = 0.195%
Peak Distortion at outermost groove = 0.218%
Peak Distortion at innermost groove = 0%
It seems that your alignment produces higher levels of distortion everywhere within the modulated groove envelope except for the innermost groove where your inner null-point is coincident with the innermost groove.
Best regards,
John Elison
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Follow Ups
- RE: Null points for 7" discs? - John Elison 07/5/1718:26:48 07/5/17 (10)
- RE: Null points for 7" discs? - flood2 16:20:50 07/6/17 (9)
- RE: Null points for 7" discs? - John Elison 18:13:38 07/6/17 (8)
- RE: Null points for 7" discs? - flood2 20:27:04 07/7/17 (7)
- RE: Null points for 7" discs? - John Elison 21:41:46 07/7/17 (6)
- RE: Null points for 7" discs? - flood2 02:42:06 07/8/17 (5)
- RE: Null points for 7" discs? - John Elison 15:31:58 07/8/17 (4)
- RE: Null points for 7" discs? - flood2 21:38:06 07/10/17 (0)
- RE: WHOA WHOA - Damián 09:21:23 07/9/17 (2)
- RE: WHOA WHOA - flood2 21:55:00 07/9/17 (0)
- RE: WHOA WHOA - John Elison 21:34:40 07/9/17 (0)