spaghetti
Active Member
I am trying to figure out how to fix my new Yamaha CA-1000 amplifier. It works fine except for an audible hum, accentuated by tone control operations... and setting the tone highs to max introduces some hiss too.
After some inconclusive hours trying to fix the issue I noticed that the noise completely disappears if I move away the tone board from its lodge. Please see this picture, if you're not familiar with this model:
The tone board is placed just above the power switch and lamp, and the class A switch operator. There's a metal shield that should protect the board from interferences, but it seems it's not effective. In the picture the tone board has been moved aside, where it produces no hum.
Is there something I can do to fix the noise issue or is this a design flaw of this Yamaha model?
Thanks,
Andrea
After some inconclusive hours trying to fix the issue I noticed that the noise completely disappears if I move away the tone board from its lodge. Please see this picture, if you're not familiar with this model:
The tone board is placed just above the power switch and lamp, and the class A switch operator. There's a metal shield that should protect the board from interferences, but it seems it's not effective. In the picture the tone board has been moved aside, where it produces no hum.
Is there something I can do to fix the noise issue or is this a design flaw of this Yamaha model?
Thanks,
Andrea