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Mark Levinson 9 - Amplifier

Publié : jeu. 11 mars 2021 15:00
par LarsOn
Hi everyone,

I have this amplifier to fix.
The problem is noise like a transfo vibrating.
Hear the noise : https://soundcloud.com/user-179997290/bruit-ampli-ml9
When I touch the transfo I don't feel vibrations.
The noise is on left and right and comes when inputs
are connected.

Any help would be great.
Thank's

Re: Mark Levinson 9 - Amplifier

Publié : ven. 12 mars 2021 12:01
par Audiophonics
LarsOn a écrit :
jeu. 11 mars 2021 15:00
Hi everyone,

I have this amplifier to fix.
The problem is noise like a transfo vibrating.
Hear the noise : https://soundcloud.com/user-179997290/bruit-ampli-ml9
When I touch the transfo I don't feel vibrations.
The noise is on left and right and comes when inputs
are connected.

Any help would be great.
Thank's
Looks like a ground loop issue.

Usually it's made by defective interconnect or source.

You can try this to fix your problem :

https://www.audiophonics.fr/fr/transfor ... _search=fs

Re: Mark Levinson 9 - Amplifier

Publié : ven. 12 mars 2021 17:18
par LarsOn
Thank's for your answer.
Is it a DC Blocker ?

Re: Mark Levinson 9 - Amplifier

Publié : lun. 15 mars 2021 11:21
par Nicko
Yes a transformer block DC and separate grounds.