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  1. #1
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    hum on pass lab integrateds ?

    reading a review of the pass lab 150 which i think is discontinued but i might be wrong there

    anyway the review said this
    Slightly bothersome was some mechanical hum from the INT-150's transformer, as well as some barely audible ground buzz coming through my speakers. I tried various power cords and different outlets in my room, but the INT-150 always wanted to make a little noise. This was barely audible at my listening seat between tracks, but I still would have rather not heard it at all.

    has anyone had trouble with hum on integrated amps
    anyone any thoughts on the new int 60 integrated ?

    https://www.stereophile.com/content/...plifier-page-2
    1]bel canto EIX/ F5 monoblocks . BC cd2, tannoy eaton legacy 2]bel canto pre 5 ,arcam a85 , black ice modded dac
    modded dac , marantz sa8005, Verity audio Rienzi

  2. #2
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    St Petersburg Fl
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    Re: hum on pass lab integrateds ?

    My int-60 is quiet as a mouse.....a dead one at that!
    Larry


    Lumin U1
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  3. #3

    Re: hum on pass lab integrateds ?

    The only one humming, when listening to the INT-60, comes from me.


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    Small rig: Naim UnitiServe/ Curious USB/ Tidal/ Linn Klimax DS3/ Shunyata Power cable/ Pass Labs INT-60/ Acoustic Zen Silver Reference II/ HiD Diamond 8/ Harbeth 30.2 40th Anniversary/ Shunyata Venom EU7 & Venom 3 HD.

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  4. #4
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    Re: hum on pass lab integrateds ?

    thanks guys , reassuring . any 150 owners care to comment too
    1]bel canto EIX/ F5 monoblocks . BC cd2, tannoy eaton legacy 2]bel canto pre 5 ,arcam a85 , black ice modded dac
    modded dac , marantz sa8005, Verity audio Rienzi

  5. #5
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    Jun 2014
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    Reno, NV
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    Re: hum on pass lab integrateds ?

    I had a 150 which had a very slight buzz in the left channel only. No way could it be heard except with your ear very close to the tweeter, and it didn’t change with the volume setting, so it wasn’t bothersome. No transformer hum. My 60 makes no non-musical noises at all.
    Rob
    __________________________
    Tascam BR-20; Technics 1506 with tape path upgrades, FM head, DeHavilland 222 tape head pre; Modwright Oppo 205 full tube mod w/LPS; Euphony Summus server, EtherRegen, HDPLEX LPS; MSB Discrete DAC (dual PS, ISLPro, balanced out); Pass Labs XP-12, XA60.8 (pair); Daedalus Audio Apollo 11’s, VMPS Larger Sub; Daedalus/Wywires, Acoustic Zen, Sablon Audio, Wireworld, Shunyata Research cables; Core Power Equi=Power;
    Adona rack, ​​​​​Stillpoints, IsoPods, ASC, GIK Acoustics accessories

  6. #6
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    North Carolina
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    Re: hum on pass lab integrateds ?

    Quote Originally Posted by hifinutt View Post
    reading a review of the pass lab 150 which i think is discontinued but i might be wrong there

    anyway the review said this
    Slightly bothersome was some mechanical hum from the INT-150's transformer, as well as some barely audible ground buzz coming through my speakers. I tried various power cords and different outlets in my room, but the INT-150 always wanted to make a little noise. This was barely audible at my listening seat between tracks, but I still would have rather not heard it at all.

    has anyone had trouble with hum on integrated amps
    anyone any thoughts on the new int 60 integrated ?

    https://www.stereophile.com/content/...plifier-page-2
    Gryphon Diablo 300 - silent. FWIW I seem to recall reading elsewhere that ground loops can lead to transformer hum under certain conditions.

  7. #7
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    Jun 2014
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    Reno, NV
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    1,675

    Re: hum on pass lab integrateds ?

    Small amounts of DC in the AC line will also cause some transformers to hum, and there are a number of ways to remove that
    Rob
    __________________________
    Tascam BR-20; Technics 1506 with tape path upgrades, FM head, DeHavilland 222 tape head pre; Modwright Oppo 205 full tube mod w/LPS; Euphony Summus server, EtherRegen, HDPLEX LPS; MSB Discrete DAC (dual PS, ISLPro, balanced out); Pass Labs XP-12, XA60.8 (pair); Daedalus Audio Apollo 11’s, VMPS Larger Sub; Daedalus/Wywires, Acoustic Zen, Sablon Audio, Wireworld, Shunyata Research cables; Core Power Equi=Power;
    Adona rack, ​​​​​Stillpoints, IsoPods, ASC, GIK Acoustics accessories

  8. #8

    Re: hum on pass lab integrateds ?

    Quote Originally Posted by rbbert View Post
    Small amounts of DC in the AC line will also cause some transformers to hum, and there are a number of ways to remove that
    I had exactly this experience with a previously owned valave amplifier that had mechanical transformer buzz like a hive of angry bees. Bought a DC blocker cable to feed the system power block and it solved the problem completely and instantly.

    I would be very surprised if a Pass Labs product was noisy without there being either a fault or another underlying issue. As an aside I do love the look of their stuff.

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