Check out this video and let me know if anyone has ever heard this humming sound before when powering up their BHK amps. The noise slowly fades until totally gone after about 2 minutes, and everything sounds fine afterwards. Only happening on right side amp, and just started after about 6 months o…

This makes sense. The amp in question has been making expansion/contraction pops every time it warms up from standby. Usually just one pop about 10-15 minutes after on, and also when cooling down back to standby temp. I am wondering now if this expansion/contraction has indeed worked something lo…

Please do contact our service department. It’s likely something simple.

Well…BHK 300 is in the possession of PS Audio. Very interested to see what the issue is. Hopefully I will have repaired or replaced monoblock by the end of next week.

What’s driving your Focals now? Or are they having a little break?

I’ll be very interested to know what the root cause is. I don’t have a mechanical noise problem with any gear in my current rig, but have in the past. It’s not that uncommon. Keep those updates coming, friend. :slight_smile:

Yes. Please follow up with the diagnosis etc.

Egads that sounds nasty. Are the amps plugged into the same circuit?

I suspect this is not related to the power transformer. The BHK starts drawing more current as soon as the power button is pressed, not 30 seconds afterwards. The noise in the video sounds moe like a chattering mute relay to me.

Loud humming coming from one BHK 300 mono at start-up

Audio Components Amplifiers

watchdog507 October 17, 2019, 11:53pm 35

It’s here:

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Loud humming coming from one BHK 300 mono at start-up

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