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MC8207 Transformer Buzzing
I am asking this for an Audiogon member who is having a hard time with this amp. He bought from a reputable authorized dealer and the left power transformer buzzes so loud he can hear it from his listening chair 10 feet away. He returned the unit for another amp and it has the same problem. He contacted McIntosh service on 3 different occasions. They first told him he needs dedicated lines so he had a licensed electrician do that, having 2 lines installed both with separate grounds, but no change. Then service told him to buy a power conditioner and he bought an Audioquest Niagra to the tune of 5 grand and still no change. The last time factory service told him he needs a DC Offset Blocker.
It seems to me they are taking stabs in the dark. He brought both amps to his friends house 10 miles away and the same problem, the left toroidal transformer buzzes. His house is new, only 5 years old with a 200 amp service. He is quite ticked to say the least. I feel bad for the guy and I am trying to help him out. Anyone?? |
#2
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Does it buzz until it’s warmed up or constantly?
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#3
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Sounds like a batch of transformers that weren’t potted properly. They pull them off the shelf as needed and he got unlucky twice.
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#4
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I had a similar problem with 2 new MC205's. Not sure if it was the transformer but I buzzing sound came out of the rear left side of both of them. I got fed up and switched to a MC8207 and it has been dead quiet since the day I got it. Strange, maybe there was a bad batch of transformers that went out. I would have him bring it back and get another new one.
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Paul Harbeth 40.3 XD, Sound Anchor stands w/ Stillpoints, Luxman M900 & C900, Aurender N20, Jay's Audio CDT3 - MK3 CD player, Mola Mola Tambaqui DAC, Shunyata Everest, Altaira |
#5
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Ouch! Can he get a loaner from the dealer to hopefully prove it is the amp that is defective and not the electrical in the house? If that works, send videos to McIntosh. I have found videos work well. And if it is a second bad amp, I would be seeking some relief from McIntosh. That’s expensive and frustrating...an ugly combination
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#6
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It buzzes constantly, warm or cold. I'm wondering why McIntosh is insisting it isn't a problem on their end?
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#7
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Quote:
Emotiva CMX-2 https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 You can also buy direct from Emotiva, but it looks like all is sold out until January 21, 2019. Ron
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Ron Processor: McIntosh MX170, Amp: Legacy Audio i-V7, Digital: Benchmark DAC3B, Roon Music Player, Oppo UDP-205, Apple TV 4K, Fire TV Stick 4K Max, Analog: Gold Note Pianosa Turntable, Gold Note PH-10 Phono Preamplifier, Donatello MC Cartridge, Speakers: Legacy Audio Signature SE Natural Sapele Pommele, Silverscreen HD Center, JL Audio e112-Gloss Sub Last edited by Poppyhome; 01-02-2019 at 11:39 PM. |
#8
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Quote:
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Ivan FLORIDA MX136, MC1.2KW(10) MC2KW(2), MCD1100, MS750(2) MVP881, C1000C/P/T, MPC1500, HT-2 SUBS(2) HT3F(2) WS350(2) XRT2K, XCS2K, XR27(2) XCS350(2) JL GOTHAM v2 SUBS(2) SILENZIO MUSIC SERVER, LUMAGEN RADIANCE SCALER, SONY VPH-G90U 4K PROJECTOR, STEWART 120" MOTORIZED SCREEN, CINEMA-TECH SEATING, WW PLATINUM CABLES Reference System: ACCUPHASE A300 AMPS, C3900 PRE-AMP, DP1000 CD/SACD TRANSPORT, DC1000 DIGITAL PROCESSOR, DG-68 DIGITAL EQUALIZER, T1200 FM STEREO TUNER, PS1230 POWER SUPPLY, HRS-SXR CUSTOM RACK w/ M3X SHELVES, TAD REFERENCE ONE MK2 LOUDSPEAKERS, WW PLATINUM CABLES CAPE COD MX150, MC501(2) MC1.2KW(10) MC2301(2) MR88, MVP881, MCD1100, MDA1000, C1000C/P/T, MPC1500, ESOTERIC K-01X 30th ANNIVERSARY (BLACK) SACD/CD PLAYER, G02-X CLOCK, HT3F(2) XRT2K, XCS2K, XR27(2) JL GOTHAM v2 SUBS(2) JL FATHOM F113v2 SUBS(4) SOUND ANCHOR STANDS(2) KALEIDESCAPE STRATO & TERRA SERVERS 80-TB, LUMAGEN RADIANCE SCALER, SONY VPH-G90U 4K PROJECTOR, STEWART 120" SCREEN, SONUS FABER STRADIVARI, SILENZIO MUSIC SERVER, FORTRESS SEATING, WW PLATINUM CABLES Analog Rig: CLEARAUDIO INNOVATION WOOD, UNIVERSAL ARM w/ Da VINCI' CART, 2nd UNIVERSAL ARM w/ GOLDFINGER STATEMENT CART, HRS-MXR REFERENCE RACK-GLOSS BLACK w/ M3X SHELVES, AESTHETIX RHEA SIG PHONO-PRE, BRYSTON BHA-1 HEADPHONE AMP, WW PLATINUM CABLES Reference System: BURMESTER 911MK3 AMP(3), 088 PRE-AMP, 089 CD PLAYER, 100 PHONO PRE-AMP, 948 POWER CONDITIONER, ACCUPHASE DG-68 VOICING EQUALIZER, AVID ACUTUS REFERENCE SP TT, GRAHAM PHANTOM II SUPREME ARM, BENZ MICRO LP-S CART, GRANDIOSO P1X/D1X STACK, G1X RUBIDIUM MASTER CLOCK, N05 NETWORK PLAYER, SILENZIO MUSIC SERVER, HRS-SXR CUSTOM RACK w/ M3X SHELVES, SONUS FABER AIDA SPEAKERS, JL FATHOM F113v2 SUBS(2) SOUND ANCHOR STANDS(2) WW PLATINUM CABLES Library System: GRANDIOSO M1 MONOBLOCK AMPS, C1 LINESTAGE PRE-AMP, K1X CD/SACD PLAYER, G1 MASTER RUBIDIUM CLOCK, E02 PHONO-PRE, SILENZIO MUSIC SERVER, AERIAL ACOUSTICS 20T V2, AERIAL SW12 SUBS(2), CANTON REF K1’s, VPI HRX TT w/ SDS POWER SUPPLY, ORTOFON CADENZA BLACK CART, KLAUDIO RCM, SHUNYATA DENALI 6000/S v2, SHUNYATA OMEGA QR’s, WW PLATINUM CABLES Esoteric/Bryston System: ESOTERIC C02-X PRE-AMP, P-02X TRANSPORT, D02-X DAC, G02-X CLOCK, BRYSTON 28B3 CUBED MONOBLOCK AMPS(4), BRYSTON BHA-1 HEADPHONE AMP, SHUNYATA DENALI 6000/S v2(2) EVEREST 8000 POWER CONDITIONER(2) ALTAIRA CG & SG HUBS, AMR-DP777-SE DAC, SILENZIO MUSIC SERVER, TAD REFERENCE ONE MK2 LOUDSPEAKERS, QUADRASPIRE RACK, WW PLATINUM CABLES Accuphase/Canton System: ACCUPHASE E800 INTEGRATED, DP570 CD/SACD PLAYER, T1200 FM STEREO TUNER, DG-68 VOICING EQUALIZER, PS530 POWER SUPPLY, CANTON REF K3’s, CANTON REF K5’s, SILENZIO MUSIC SERVER, HRS MXR REFERENCE MAHOGHANY RACK w/ M3X2 SHELVES, WW GOLD CABLES |
#9
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Hi guys,
I am the one with the problem that @stereo_5 posted or made this thread for me, I forgot that I had an account here. So the problem that I am having is why do I have to buy a DC blocker to block the buzz, isn't this going to be masking the problem if the transformer is bad, have you ever thought of this? Second of all, when you buy this expensive amp wouldn't you be thinking that when you get it home all you should do is plug it in and listen to the music or movies. Third, if I have a DC in my AC why only one of the transformers buzz why not the other one? I am really confused and electrician is even more confused than me trying to solve a problem that could not be solved due to a bad transformer. He was laughing his arse off when I told him how much I paid for it. |
#10
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Quote:
Don't you think that having a DC Blocker is going to be masking the problem, I was told by a company that makes isolation products that this kind of mechanical buzz is only from a bad transformer and having a DC blocker would just mask the problem and not fix a bad transformer. |
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