Mace reverb hum

dlb · 07-31-2008, 10:15 PM

I appreciate the earlier help with getting my old Mace amp up and running.

Somewhere along its history the reverb tank was removed. I purchased a new 4EB2C1B tank and installed. There is a very prevalent hum when the reverb control is barely increased from 0.

The input and output cables are new although not the original type.

Is there a certain filter capacitor I should be looking at?

Thanks again for the help!

oc disorder · 07-31-2008, 10:24 PM

Try rotating it 180 deg If the output of the tank transducer is sitting directly under the power transformer it will hum.

dlb · 08-01-2008, 12:36 AM

Damn... that did it! Thanks!

The only small issue now is when the reverb control is > ~75% I get a weird squeal type sound. Anything less than 75% is good.

Thanks again!

oc disorder · 08-01-2008, 12:57 AM

Maybe its induced feedback .. move the speaker wires as far away from the reverb/rev. wires as possible.Also try grounding the speaker frames.
If the shielding around the reverb wires is not good could cause it too.

07-31-2008, 10:15 PM	#1
dlb Junior Member Join Date: Jun 2008 Posts: 5	Mace reverb hum I appreciate the earlier help with getting my old Mace amp up and running. Somewhere along its history the reverb tank was removed. I purchased a new 4EB2C1B tank and installed. There is a very prevalent hum when the reverb control is barely increased from 0. The input and output cables are new although not the original type. Is there a certain filter capacitor I should be looking at? Thanks again for the help!

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07-31-2008, 10:24 PM	#2
oc disorder Senior Member Join Date: Jul 2006 Posts: 428	Try rotating it 180 deg If the output of the tank transducer is sitting directly under the power transformer it will hum.

08-01-2008, 12:36 AM	#3
dlb Junior Member Join Date: Jun 2008 Posts: 5	Damn... that did it! Thanks! The only small issue now is when the reverb control is > ~75% I get a weird squeal type sound. Anything less than 75% is good. Thanks again!

08-01-2008, 12:57 AM	#4
oc disorder Senior Member Join Date: Jul 2006 Posts: 428	Maybe its induced feedback .. move the speaker wires as far away from the reverb/rev. wires as possible.Also try grounding the speaker frames. If the shielding around the reverb wires is not good could cause it too.

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