Sign in to follow this  
Bigwig07

Roksan Caspian M2 Amp Power Hum

Recommended Posts

I have the above amp, and I get a low level power hum from it which is annoying / worrying. Its so low level that you don't notice it unless you stand by it. The hum is heard when the amp is in standby and powered up, but not affected by volume.

Is this normal, or likely to be a grounding issue needing repair ? (I am out of warranty unfortunately)

Share this post


Link to post
Share on other sites
Super Wammer

Is this a mechanical hum, or through the loudspeakers? 

If mechanical, then it might be that the transformer isn’t secured quite as tight as it should be, or possibly that your mains is ‘dirty’ and it is reacting to this.  Is it louder or quieter at different times of the day?  

Share this post


Link to post
Share on other sites
4 minutes ago, Nopiano said:

Is this a mechanical hum, or through the loudspeakers? 

If mechanical, then it might be that the transformer isn’t secured quite as tight as it should be, or possibly that your mains is ‘dirty’ and it is reacting to this.  Is it louder or quieter at different times of the day?  

Mechanical - from the amp itself. 

I don't think its the mains as my other kit works fine. Is it possible to resecure the transformer ?

Share this post


Link to post
Share on other sites
Super Wammer
Just now, Bigwig07 said:

Mechanical - from the amp itself. 

I don't think its the mains as my other kit works fine. Is it possible to resecure the transformer ?

I’m not familiar with the insides, but there is typically a bolt (or several).  It may not need to be ‘as tight as possible’ either, especially if it sits on some sort of insulating washer or mount.  We might be better waiting for an expert to read this, or for you give Roksan a ring.  It might even be a known fault they can fix.  

Dirty mains can definitely ‘excite’ an amp but not any other source.  It has probably the most powerful transformer of all your gear.  I once had a Musical Fidelity power amp which would buzz when our coffee machine was on, and occasionally had fits of buzzing.  Everything else was dead quiet.  

Share this post


Link to post
Share on other sites
Super Wammer

I’ve just googled some images of your integrated amp, and there seem to be two transformers.  Without more homework I’m assuming the larger one is for the power section, and the smaller for the preamp.  I suspect the larger one is the culprit, and as a toroidal design it has one visible fastening nut. 

With the power disconnected and left for a few hours, you could remove the cover to see if anything is loose. But only if you’re confident!

Share this post


Link to post
Share on other sites
9 hours ago, Nopiano said:

I’ve just googled some images of your integrated amp, and there seem to be two transformers.  Without more homework I’m assuming the larger one is for the power section, and the smaller for the preamp.  I suspect the larger one is the culprit, and as a toroidal design it has one visible fastening nut. 

With the power disconnected and left for a few hours, you could remove the cover to see if anything is loose. But only if you’re confident!

Great thanks, I'll give it a try - I'll probably wear rubber gloves !

Share this post


Link to post
Share on other sites
Super Wammer
28 minutes ago, Bigwig07 said:

Great thanks, I'll give it a try - I'll probably wear rubber gloves !

Good luck, and give them a call first.  They might say it’s a known issue and offer a free replacement!

https://www.roksan.com/en/support/contact-us/

Share this post


Link to post
Share on other sites
20 minutes ago, Nopiano said:

Good luck, and give them a call first.  They might say it’s a known issue and offer a free replacement!

https://www.roksan.com/en/support/contact-us/

Thanks - I wonder if the transformer bolt should be tightened to a recommended torque ?

Share this post


Link to post
Share on other sites
Super Wammer

Something else to ask!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.