Preamp buzz?

nms
nms Posts: 671
edited April 2008 in 2 Channel Audio
Carver HR 752 receiver w/ preouts acting as a pre, Carver PM-350 for an amp. When the receiver and amp are on I get a slight buzz from the speakers. With the receiver off it's dead silent. When I was using just the receiver (no stand alone amp) there was no buzz.

Any ideas? This is just slightly annoying and strange, not an emergency.
My system

"The world is an ever evolving clusterf*ck." --treitz3
Post edited by nms on
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Comments

  • joeparaski
    joeparaski Posts: 1,865
    edited April 2008
    I had that problem too. You can first try this very simple thing....plug your amplifiers' power cord into an extension cord and remove the 3rd pin from the extension cord and plug it into the wall. If the buzz is gone, you have a ground loop problem.

    Joe
    Amplifiers: 1-SAE Mark IV, 4-SAE 2400, 1-SAE 2500, 2-SAE 2600, 1-Buttkicker BKA 1000N w/2-tactile transducers. Sources: Sony BDP CX7000es, Sony CX300/CX400/CX450/CX455, SAE 8000 tuner, Akai 4000D R2R, Technics 1100A TT, Epson 8500UB with Carada 100". Speakers:Polk SDA SRS, 3.1TL, FXi5, FXi3, 2-SVS 20-29, Yamaha, SVS center sub. Power:2-Monster HTS3500, Furman M-8D & RR16 Plus. 2-SAE 4000 X-overs, SAE 5000a noise reduction, MSB Link DAC III, MSB Powerbase, Behringer 2496, Monarchy DIP 24/96.
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  • ben62670
    ben62670 Posts: 15,969
    edited April 2008
    Also unplug the CATV wire. That was an issue with mine.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • nms
    nms Posts: 671
    edited April 2008
    ben62670 wrote: »
    Also unplug the CATV wire. That was an issue with mine.

    Thanks Joe. I'll have to see how I've got them wired up, I may indeed have a ground loop issue. Is a GL usually quiet or loud?

    Ben,

    You mean like a network cable?
    My system

    "The world is an ever evolving clusterf*ck." --treitz3
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  • ben62670
    ben62670 Posts: 15,969
    edited April 2008
    The cable TV wire has gotten me in the past. It was hooked up to my TV, and my TV was hooked up to my receiver (RCA patch cable). That gave me a buzz:D
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • skipf
    skipf Posts: 694
    edited April 2008
    Also check your IC's between the pre and amp, I've had a bad one that caused a buzz.
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  • phipiper10
    phipiper10 Posts: 955
    edited April 2008
    Cable TV was my problem. Solved it (90%+) by using the following -

    http://www.partsexpress.com/pe/showdetl.cfm?Partnumber=180-075

    Also could have plugged CATV into my monster hts1000.

    Good luck
    Analog Source: Rega P3-24 Exact 2 w/GT delrin platter & Neo TT-PSU Digital Source: Lumin T2 w/Roon (NUC) DAC: Denafrips Pontus II Phono Preamp: Rega Aria MK3 Preamp: Rogue RP-7 Amp: Pass X150.8 Speakers: Joseph Audio Perspective 2, Audio Physic Tempo Plus Cables: Morrow M4 ICs & Audio Art SC-5 ePlus, Shunyata PCs Misc: Shunyata Hydra Delta D6, VTI rack, GIK acoustic panels
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  • F1nut
    F1nut Posts: 50,557
    edited April 2008
    If you can't find a solution, talk to Rolland. He knows Carver gear.

    Hi-Tech Audio Ltd.
    2125 SW 19th St.
    Gresham Oregon 97080

    Office: (503) 618-7605
    Fax: (503) 674-8593
    http://www.carveraudiorepair.com
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • joeparaski
    joeparaski Posts: 1,865
    edited April 2008
    nms wrote: »
    Thanks Joe. I'll have to see how I've got them wired up, I may indeed have a ground loop issue. Is a GL usually quiet or loud?



    In my case, the ground loop would get louder the longer the system was on....to a certain point of course.


    Joe
    Amplifiers: 1-SAE Mark IV, 4-SAE 2400, 1-SAE 2500, 2-SAE 2600, 1-Buttkicker BKA 1000N w/2-tactile transducers. Sources: Sony BDP CX7000es, Sony CX300/CX400/CX450/CX455, SAE 8000 tuner, Akai 4000D R2R, Technics 1100A TT, Epson 8500UB with Carada 100". Speakers:Polk SDA SRS, 3.1TL, FXi5, FXi3, 2-SVS 20-29, Yamaha, SVS center sub. Power:2-Monster HTS3500, Furman M-8D & RR16 Plus. 2-SAE 4000 X-overs, SAE 5000a noise reduction, MSB Link DAC III, MSB Powerbase, Behringer 2496, Monarchy DIP 24/96.
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  • F1nut
    F1nut Posts: 50,557
    edited April 2008
    A ground loop sounds like a 60 cycle hum because that's what it is. It could be fairly loud or it could be softer, but it won't change volume on it's own.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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