hum on pass lab integrateds ?

hifinutt

hifinutt

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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/pass-labs-int-150-integrated-amplifier-page-2
 
The only one humming, when listening to the INT-60, comes from me.


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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.
 
hifinutt said:
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/pass-labs-int-150-integrated-amplifier-page-2
Click to expand...
Gryphon Diablo 300 - silent. FWIW I seem to recall reading elsewhere that ground loops can lead to transformer hum under certain conditions.
 
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
 
rbbert said:
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
Click to expand...

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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