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#1
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Swooshing sound on mc275vi
I purchased a used mc275 vi and im finding:
1.It makes a swooshing sound when first turned on that lasts for around 4 seconds 2.Background noise from both speakers when input is on phono. This repros with both a c46 and a c2300. Using XLR to RCA cables as interconnects. RCA into the amp. Any ideas? |
#2
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Who can give advise regarding the tubes?
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Two Channel: McIntosh C2300 preamp, MC601 amps x2, MR88 tuner, MEN220; Esoteric K-03X; Aurender N100C 4TB; B&W 802D2 Diamonds, JL Audio F113V2 x 2 on Sound Anchor Sub Stands; VPI Classic Signature Piano Black, Ortofon Cadenza Black, VPI SDS, periphery ring, StillPoints center weight, Gingko Audio ClaraVu Dust Cover CT, KAB SpeedStrobe, Dr. Feickert Analogue Protractor; Sonos with W4S digital modification to W4S Remedy to Esoteric; W4S PS1 Linear Power unit for the 2x Remedy and Recovery w/ W4S PS1 Power Cord; Torus RM20; Wireworld Silver Series 7 Electra/Starlight/Eclipse cables and WW Platinum Power Cord for Amps and Platinum USB for Aurender; KLAUDIO RCM; Steve Blinn Designs extra wide three shelf rack; GIK Acoustics panels and bass traps, StillPoints Ultra Minis under all gear and Stillpoint Ultra SS under amps and speakers. Home Theater 7.2: McIntosh MX150, MC452, MC207; B&W 803D2 Diamonds, HTM2 center, CWM7.3 surrounds; JLAudio F112 x2 subs; Panasonic TC-P65ZT60 65" Studio Master Plasma; Oppo 205; Crown FM Two Tuner; Sonos with W4S Remedy; Apple TV; Furman Elite 20 amp PFi x2; WW and AQ Cables/Cords; Salamander Synergy Four Bay Cabinet Office 2ch with McIntosh vintage refurbished gear: McIntosh MC275V6 x2 tube amps; Klipsch Cornwall I vintage speakers (1982); AQ Dragonfly Red DAC/Jitterbug/cables; PS Audio Dectet Power Center; Mcintosh C28, MC2105, MR78 (with mod), MQ101, each with original walnut cabinet and panloc (1976), MCD7008 (1996), ML1C speakers (1976); Bang & Olufsen Beogram 4002 turntable (1976) with new SoundSmith SMMC20CL cartridge (2015); Salamander double rack |
#3
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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 |
#4
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I can’t comment on the phono issue because I don’t use a turntable but regarding the swooshing, can you elaborate? I think what you’re describing is this:
When the lights on the tubes go from amber to green, the sound turns on. At this point is the volume slightly lower and then increases for just a few seconds and then levels off? At the same time, does the signal first sound slightly distorted and then clear up along with the increase in volume during those first few seconds? If so, I believe your tubes just haven’t finished warming up in the time that the amp has allotted during the turn on sequence. Some tubes just take a little longer to warm up.
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McIntosh MC462, C22 IV, and MR7084; Simaudio Moon 300D V2 DAC; Technics SL1200G, Mac Mini Server; Sonus Faber Grand Piano Home; and Wireworld Cables. |
#5
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Thanks for the willingness to help. I typically turn the preamp on then the MC275 and let them turn green. All seems well and no music is playing. Preamp can be on any input. Then I hear the swooshing sound which increases in volume and as I run over to turn the volume down it turns quieter and disappears.
The second issue: I assumed the MC275 background noise would be quiet but mine is audible when I put my ear to the speaker. Note this unit was described as being in B1 condition, and all tubes light up green so not sure what the issue is. |
#6
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Tube noise in the first couple of minutes is normal if it goes away and second if you have to put your ear up to the speaker to hear "tube noise" you don't have a problem. All tube gear makes noise if you put your ear up to the tweeter.
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Jack |
#7
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Quote:
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McIntosh Labs |
#8
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Get a new tube, replace the tubes and see if you you can recreate the isssue. By processes of elimination you may determine which tube is defective. If it continues after checking them all then i would say it’s not the tubes. A bit tedious but it’s one way to do it, plus it’s always good to have a spare tube.
Just an idea...2cts |
#9
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Thanks guys. To those that have changed stock tubes on the 275mkvi, how did you find the sound quality and noise changed?
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#10
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I make a point of turning my PreAmp volume to zero before shutting my system down. I think it is a good habit to get into - especially in a system with tubes.
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Main Equipment: Kharma Elegance dB11-S, JL Audio F113v2 X 2, Block Audio Line & Mono SE Amplification, Bricasti M21 DAC, Antipodes Kala K-50 Server, Clearaudio Performance SE. Satisfy tonearm & Maestro Wood MM cartridge. Power: Shunyata Everest 8000, Sigma XC v2, Sigma NR v2, Block Audio PCs, Defender, ADDPowr Wizard Grounding: Shunyata Altaira CGS - 4 X Alpha CGS cables, Network : Supra Cat 8+, Twin (Nenon) Modified Buffalo GS2016 Switches, Keces P3 LPSU, Cables: Wireworld Platinum 8 USB, Wireworld Platinum Eclipse 8 Speaker cables, 6M & 1M Tubulus Concentus ICs, Other:Two PSI Audio AVAA C20, Multiple GIK products, Stillpoint Apertures, Stillpoint Minis and Ultra SS, Three 20 Amp lines, Furutech GTX - Gold outlets, Adona Rack |
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