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Mark Levinson 335 Power Amp hum

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Posted on January 1, 2017 at 12:13:10
RIQUE
Audiophile

Posts: 98
Location: Florida
Joined: May 15, 2016
Lately I can hear a distinct hum from y ML335 power amp. Its not very strong like lap top fan is running. It hums live and on standby. No issues with amp operation all is perfect but... Any owners can comment if this is normal?

THanks.

 

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RE: Mark Levinson 335 Power Amp hum, posted on January 2, 2017 at 01:30:47
JURB
Audiophile

Posts: 228
Location: North Ohio
Joined: May 29, 2016
I don't have one but if it does have a standby it is probably the laminations in the standby transformer getting loose.

 

RE: Mark Levinson 335 Power Amp hum, posted on January 2, 2017 at 05:41:29
PAR
Audiophile

Posts: 2020
Location: South London
Joined: April 15, 2013
Contributor
  Since:
January 12, 2014
I am assuming that you mean a hum from the amp itself and not a hum through the loudspeakers.

You say that it has only occured "lately" but is not very strong in intensity.

It sounds like the transformer is humming because of distortion on the incoming mains supply. Perhaps your utility supplier has recently made some kind of change or there is some other user locally causing the distortion?

Does it vary at different times of the day (or night)? Could you try the amp at another location not in your immediate locality? That may help confirm whether or not my suggestion is correct or not.


 

RE: Mark Levinson 335 Power Amp hum, posted on January 2, 2017 at 05:59:57
RIQUE
Audiophile

Posts: 98
Location: Florida
Joined: May 15, 2016
Yes indeed you are correct. I mean a hum from the amp itself not one through the speakers. I am suspicious of the power cable I'm using I noticed the AC input conector a bit loose. It is connected to a PS Audio power conditioner. I will see what happens if I go direct to the wall.

 

RE: Mark Levinson 335 Power Amp hum, posted on January 2, 2017 at 15:00:45
fantja
Audiophile

Posts: 10018
Location: Alabama
Joined: September 11, 2010
Check all cabling and connections 1st.

 

RE: Mark Levinson 335 Power Amp hum, posted on January 2, 2017 at 21:37:16
PAR
Audiophile

Posts: 2020
Location: South London
Joined: April 15, 2013
Contributor
  Since:
January 12, 2014
Which PS conditioner are you using as they make or made many types? Some will deal with the distortion component (i.e. DC) but not all I believe. The regenerators and the Humbusters will (or should).

 

RE: Mark Levinson 335 Power Amp hum, posted on January 4, 2017 at 19:28:42
Sharpstat
Audiophile

Posts: 42
Location: So.CA
Joined: February 3, 2001
Having owned one in the past I would say either the transformer or more likely the capacitors in the amp itself. The first batch manufactured were bad straight from the supplier but yet made it out into the field on some units.

 

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