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Old 07-11-2016, 05:34 AM
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Default Buzzing sound from Ref75
After having the unit on for 4-5 hours I noticed a buzzing sound. Initially I thought it was coming from the speakers or from a input. I turned off the DAC and Ref5, but the buzzing sound was still present and coming from inside the unit.

I turned it off and then back on about 30mins later and the sound was gone.

Anyone experienced this before?

Could it be dust on the tubes making the sound or the tubes themselves?

Cheers
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Old 07-11-2016, 07:21 AM
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Nick.......Just a guess, but it could be vibration in one of the transformers. Occasionally the laminations in a transformer will buzz when warm. That's the reason McIntosh tar pots its transformers inside their transformer cans. That process eliminates lamination buzz. You can use 3/4" clear plastic tubing, perhaps a four foot piece, like a stethoscope to listen to each transformer and other areas of the amplifier by placing one end of the tube to you ear and move the other end from part to part until you identify the noise source.
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Old 07-11-2016, 11:32 PM
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Interesting. I will pull it out of the rack and open it up and give it a listen.

Its definitely doing it after a few hours of use and doesn't seem to be affecting the sound quality. Thanks for the tip.
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Old 07-14-2016, 03:54 PM
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I also experience what I think is a transformer buzz/hum from my Ref75 SE. Some have said some hum is normal. I live with it.
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Old 07-14-2016, 09:49 PM
jpgr4blu jpgr4blu is offline
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discernible transformer hum is not part of my ARC experience in my last 8 components.
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Old 07-14-2016, 10:59 PM
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Just had the unit picked up by the ARC rep, the transformer is faulty and needs to be replaced.

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Old 07-15-2016, 10:12 AM
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Nick.......That shelf sure looks empty!
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STUDIO - McIntosh C1000C/P, MC2301 (2), MR88, Aurender N10, Esoteric K-01X, Shunyata Sigma spdif digital cable, Sonos Connect, PurePower 2000, Stillpoints, Furutech Flux 50, Michell Gyro SE, Michell HR Power Supply, SME 309, Ortofon Cadenza Black, Wireworld, Sonus faber Amati Anniversario
LIVING ROOM - McIntosh C2300, MC75 (2), MR85, Magnum Dynalab 205, Simaudio MOON Neo 260D-T, Schiit Audio Yggdrasil, Aurender N100H, Shunyata Sigma USB cable, Micro Seiki DD40, Ortofon Cadenza Blue, Nakamichi BX-300, Sony 60ES DAT, PS Audio P10, Furutech Flux 50, Sonos Connect, Stillpoints, Wireworld, Kimber, PMC EB1i, JL Audio f113
VINTAGE - McIntosh MA230, Tandberg 3011A tuner, Olive 04HD, Sony DTC-59ES DAT, McIntosh 4300V, JBL 4312A
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Old 07-15-2016, 10:52 AM
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I should have mine looked at. It is still under warranty.
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Old 07-15-2016, 11:58 AM
Harlequin Harlequin is offline
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Quote:
Originally Posted by jpgr4blu View Post
discernible transformer hum is not part of my ARC experience in my last 8 components.
I have to agree with blu here, several varied units over the years, all deathly quiet, Ahhhem... blown output stage/tube tho
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Old 07-16-2016, 06:50 AM
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Quote:
Originally Posted by jdandy View Post
Nick.......That shelf sure looks empty!
I wonder....

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