Thanks Norman. I have ordered new grommets for the motor. I also plan to lube it. I'll try your remedy also.
Hum from Empire 698
Hi guys.
I'm having a hum problem with a 698 that was given to me. The motor is not completely quiet either.
When it was given to me the headshell was broken so I replaced it with a standard removable type. This required trimming the length of the arm about a .5 inch and rewiring the arm. The internal wire was replaced with van den Hul. The arm works great and is quiet on it's own. I did have to add a ground wire from the chassis to the tonearm ground to stop a loud hum from occurring.
When playing a record there is a constant hum until the arm is returned to the armrest. As long as the arm is in the rest it is quiet. As soon as the arm is raised from the rest there is a hum. There is also some noise from the motor but it can't be heard from a couple of feet away.
I took the circuit board out and looked at the caps and it appears the power switch capacitor has been changed to a Sprague .2uf 600v.
Any ideas?
I'm having a hum problem with a 698 that was given to me. The motor is not completely quiet either.
When it was given to me the headshell was broken so I replaced it with a standard removable type. This required trimming the length of the arm about a .5 inch and rewiring the arm. The internal wire was replaced with van den Hul. The arm works great and is quiet on it's own. I did have to add a ground wire from the chassis to the tonearm ground to stop a loud hum from occurring.
When playing a record there is a constant hum until the arm is returned to the armrest. As long as the arm is in the rest it is quiet. As soon as the arm is raised from the rest there is a hum. There is also some noise from the motor but it can't be heard from a couple of feet away.
I took the circuit board out and looked at the caps and it appears the power switch capacitor has been changed to a Sprague .2uf 600v.
Any ideas?
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- 6 posts total
normansizemore283 posts"Sounds like the cartridge is picking up a open ground loop..." That doesn't make any sense. A ground loop and an open ground are completely opposite things. A ground loop is the result of two or more paths to ground with different voltage potentials. An open ground is an open (incomplete) circuit. The most likely cause is a cartridge that susceptible to motor hum. Grados are especially vulnerable to hum fields. You might also check your arm wiring. That there is no hum when it is at rest is no assurance the wiring is ok, because of course the wiring must twist to some extent as the arm pivots. |
- 6 posts total