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Best Way to eliminate mechanical hum on PSU?

Anything about hardware musical instruments.

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KVRAF
 
2090 posts since 12 Jun, 2004

Postby mztk; Wed Mar 12, 2014 6:56 am Best Way to eliminate mechanical hum on PSU?

my old tx81z has always had a bit of an electro-mechanical hum:
it is old and has been around, and the transformer is probably a
bit loose.

i read that you should tighten everything up. will that work?
how about adding a bit of 2-part strong flexible adhesive between
it and the chassis? if so, how much should be used? just a film or
a good blob? what is the type of adhesive/compound to use?
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KVRist
 
127 posts since 26 Sep, 2013, from Cavardiras, CH

Postby Phil999; Wed Mar 12, 2014 8:47 am Re: Best Way to eliminate mechanical hum on PSU?

I found two methods that work well:

- the one method you mentioned, tightening everything to prevent vibration. One way not mentioned is to stick wood between the PSU and the chassis.

- put the PSU outside the chassis, on a plank of wood. You must add a "Danger" sign and prevent children and animals to enter the room with key locks.
KVRist
 
385 posts since 7 Jul, 2004

Postby noizetronic; Wed Mar 12, 2014 9:09 am Re: Best Way to eliminate mechanical hum on PSU?

- rubber washers into the transformer mount and the PSU/PCB mount
- a bit of hot glue onto the base of coils (only if they're not getting too hot during use)
KVRAF
 
2090 posts since 12 Jun, 2004

Postby mztk; Wed Mar 12, 2014 10:08 am Re: Best Way to eliminate mechanical hum on PSU?

ah so the coli etc. inside can be loose/vibrating too?
to be honest i haven't even ever opened it up :)

Phil, i know why you're called 999...
lfm
KVRAF
 
2620 posts since 22 Jan, 2005, from Sweden

Postby lfm; Wed Mar 12, 2014 10:53 am Re: Best Way to eliminate mechanical hum on PSU?

noizetronic wrote:- rubber washers into the transformer mount and the PSU/PCB mount


Especially a chassi mount transformer can become dead silent with rubber washers. I did that to a rack unit.

I have another one with PCB mount transfomer, and it's more difficult and no screws or anything like that. So mechanical noise transfer to MB and then into chassi unit.

It helped quite a bit to put damper selfadhesive on the plastic joint towers that support MB in unit. Maybe down 20dB or so.

I had a TX81Z with that problem in the 80's, so it seems to be a common problem. But never looked inside that unit to see if possible to do anything.

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