Audio Research 75SE

opus10no12

New Member
Jul 19, 2021
5
0
1
71
Hi
I’m new to this forum and may have posted this somewhere else by mistake!
I would appreciate the benefit of members knowledge and experience.
I turned on my Audio Research 75SE ( 4 years old, 2,000 hours) a couple of weeks ago and was rewarded with a loud bang from the amplifier.
There was no smoke or smell of burning.
There was sound from the Left speaker but none from the Right.
The twoVDU meters lit up and I turned it off.
After a cup of tea, the lid came off the 75 SE and there was little to see or smell.
EXCEPT - the bottom right hand ( looking down on the amp from the front ) capacitor in the large array in the middle was slightly bulging on top and the Nichicom wrapper has come apart at the base.
It was turned on via the remote link from the AR LS 26 ( 6 years 3000 hours)
The speakers under threat are Martin Logan Expression 13A’s and amps being fed by an AR cd5.
Like several others I have had problems with the VDU meters ( light on R channel goes off but fixed after scientifically jiggling wire to it , and R VDU needle not moving, again fixed temporarily by scientifically tapping meter ).
Does this ring any bells with anyone.
I would appreciate some feedback before presumably having to return this to the UK importer for repair.
The KT 150’s have tested ok by an independent expert.
BW
Opus10no12
 

Bobvin

VIP/Donor
Jun 7, 2014
1,658
2,928
615
Portland
www.purewatersystems.com
A capacitor failed. Nothing to do but have it repaired. Sadly, capacitors sometimes fail.
 

opus10no12

New Member
Jul 19, 2021
5
0
1
71
Thanks,
There are 9 capacitors.
Would they all have to be replaced
It looks as though I may have to do a few things around the house to get brownie points!
BW
Opus10no12
 

Bobvin

VIP/Donor
Jun 7, 2014
1,658
2,928
615
Portland
www.purewatersystems.com
Just the failed one.
 

Ron Resnick

Site Co-Owner, Administrator
Jan 24, 2015
16,017
13,346
2,665
Beverly Hills, CA
Welcome to WBF, Opus10no12!
 

matakana

Well-Known Member
Aug 26, 2020
371
188
115
61
UK
Hi
I’m new to this forum and may have posted this somewhere else by mistake!
I would appreciate the benefit of members knowledge and experience.
I turned on my Audio Research 75SE ( 4 years old, 2,000 hours) a couple of weeks ago and was rewarded with a loud bang from the amplifier.
There was no smoke or smell of burning.
There was sound from the Left speaker but none from the Right.
The twoVDU meters lit up and I turned it off.
After a cup of tea, the lid came off the 75 SE and there was little to see or smell.
EXCEPT - the bottom right hand ( looking down on the amp from the front ) capacitor in the large array in the middle was slightly bulging on top and the Nichicom wrapper has come apart at the base.
It was turned on via the remote link from the AR LS 26 ( 6 years 3000 hours)
The speakers under threat are Martin Logan Expression 13A’s and amps being fed by an AR cd5.
Like several others I have had problems with the VDU meters ( light on R channel goes off but fixed after scientifically jiggling wire to it , and R VDU needle not moving, again fixed temporarily by scientifically tapping meter ).
Does this ring any bells with anyone.
I would appreciate some feedback before presumably having to return this to the UK importer for repair.
The KT 150’s have tested ok by an independent expert.
BW
Opus10no12
Hello Opus and welcome,
I have used the absolute sounds ( uk importer ) engineer for some 25 yrs, better you go direct as you will save some coin, if you want I can private mail you his email.
 

Argonaut

Well-Known Member
Jul 30, 2013
2,379
1,615
530
N/A
Thanks,
There are 9 capacitors.
Would they all have to be replaced
It looks as though I may have to do a few things around the house to get brownie points!
BW
Opus10no12

Sorry to read of your fault, the 75SE’s have a pretty good fault record. Do you mean one of the 470uF caps in the main power supply tank ? there are six per channel...no worries it should be a straight forward repair but will require a return to SW20.
 

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