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Fender Deluxe 90 hums
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John Smith
Jul 5, 2017, 9:01:53 PM7/5/17
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It hums, said the customer.
I'll take a look, I said.
After a cleanup I tested it and couldn't find anything electrically wrong.
But with nothing except power connected there always seemed to be a faint
hum from the speaker.
Probably normal I thought. It doesn't seem to be the highest quality design.
But then I noticed that the bench seemed to be vibrating a little.
And when I disconnected the speaker the hum remained.
It's actually caused by the power transformer.
Pushing hard on the back of the unit by the transformer eliminates the hum.
Perhaps tightening the transformer bolts will fix it.
I'll take a look, I said.
After a cleanup I tested it and couldn't find anything electrically wrong.
But with nothing except power connected there always seemed to be a faint
hum from the speaker.
Probably normal I thought. It doesn't seem to be the highest quality design.
But then I noticed that the bench seemed to be vibrating a little.
And when I disconnected the speaker the hum remained.
It's actually caused by the power transformer.
Pushing hard on the back of the unit by the transformer eliminates the hum.
Perhaps tightening the transformer bolts will fix it.
Phil Allison
Jul 5, 2017, 9:19:30 PM7/5/17
to
Tightening the mounting bolts might help.
.... Phil
N_Cook
Jul 6, 2017, 3:31:49 AM7/6/17
to
all around the E&I soft iron plates.
Check soldering at the input socket ground lines as well.
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