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What causes the change at 120 hz? Before needle drop it's -67 db. After it jumps to almost -50 db. 60 hz only changes by 4 db. 180 hz and beyond appear to be unchanged.
Before needle drop
After needle drop
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Topic - hum related - rrob 08:09:10 01/17/15 (17)
- RE: hum related - John Elison 09:49:20 01/17/15 (9)
- Wow! Very interesting, John. Thanks. nt - andyr 03:07:25 01/18/15 (0)
- RE: hum related or bearing noise? - rrob 10:20:54 01/17/15 (7)
- RE: hum related or bearing noise? - John Elison 12:57:26 01/17/15 (6)
- RE: hum related or bearing noise? - rrob 14:30:39 01/17/15 (5)
- RE: hum related or bearing noise? - John Elison 15:41:50 01/17/15 (4)
- RE: hum and motor noise - rrob 19:14:31 01/17/15 (3)
- "With the motor spinning and the belt removed, the 120 hz frequency still increased" ... - andyr 17:20:51 01/18/15 (1)
- RE: "With the motor spinning and the belt removed, the 120 hz frequency still increased" ... - rrob 17:44:31 01/18/15 (0)
- Huh, goes to show that belt drive doesn't fix everything. -nt - Bry 13:18:28 01/18/15 (0)
- RE: hum related - BPoletti 08:29:20 01/17/15 (6)
- RE: hum related - rrob 09:18:05 01/17/15 (5)
- RE: hum related - BPoletti 10:15:11 01/17/15 (4)
- RE: hum related - rrob 10:51:39 01/17/15 (3)
- RE: hum related - BPoletti 11:19:02 01/17/15 (2)
- RE: hum related - rrob 14:38:04 01/17/15 (0)
- RE: hum related - rrob 11:45:52 01/17/15 (0)