[Gergor]

Quote:

Originally posted by kelly Is the hum still present with all sources disconnected?

Yup, hum still exists, no more no less. Any idea please?

 

[kelly]

Quote:

Originally posted by Gergor Yup, hum still exists, no more no less. Any idea please?

Try a different power cable. If that doesn't work, try it at a different location altogether. I've had lots of funky power stuff so I'm just trying to cover all the bases before we default to a problem with the amp.

 

[Gergor]

Quote:

Originally posted by kelly Try a different power cable. If that doesn't work, try it at a different location altogether. I've had lots of funky power stuff so I'm just trying to cover all the bases before we default to a problem with the amp.

Just tried a different cable, hum still there. I'll try a different outlet tomorrow.

 

[Hirsch]

A ground loop is not necessarily a fault with anything. They happen. The Headroom Max has a switch in the back to disconnect the ground, which makes it very simple to cure hum problems if a ground loop pops up. A "cheater plug" works just as well.

 

[Gergor]

With only the amp alone, there should be no ground loop, right? However I still get hum, are there other cause of hum other than ground loop? Or there's a ground loop within the amp itself?

 

[Hirsch]

Quote:

Originally posted by Gergor With only the amp alone, there should be no ground loop, right? However I still get hum, are there other cause of hum other than ground loop? Or there's a ground loop within the amp itself?

I went through this when I auditioned the Max. It did the same thing, but floating the ground fixed the problem (the switch on the amp to float the ground was an indicator that it's fairly common). I'm not 100% sure that you've got the same issue, but it certainly sounds like it. Radio Shack has a very liberal return policy if the two-prong plug doesn't work.

 

[Gergor]

Ok, I came home with a 2-prong adaptor from radio shack. Nop, it still hums. I moved the amp from room to room and tried different outlets. It doesn't matter, still hums. Nothing gets rid of the hum, I'm having a terrible humming nightmare!

I have no idea what else to do. I guess I'll email Sugden and see how (and if) they respond.

Please let me know if you have any idea. Thanks.

 

[sonyearphones]

Bah Hummmmm Bug. Now I am planting this amp in my mind.

 

[dave-the-rave]

but can it carry a tune?

 

[Hirsch]

Quote:

Originally posted by Gergor Ok, I came home with a 2-prong adaptor from radio shack. Nop, it still hums. I moved the amp from room to room and tried different outlets. It doesn't matter, still hums. Nothing gets rid of the hum, I'm having a terrible humming nightmare! I have no idea what else to do. I guess I'll email Sugden and see how (and if) they respond. Please let me know if you have any idea. Thanks.

At this point I can't think of anything to do besides getting in touch with Sugden. It sounds like there's an internal ground problem.

 

[Gergor]

I already sent a email to Sugden. Thanks for all the help I'm getting here from Hirsch, kelly and zzz. I'll keep you posted once I hear from Sugden.

 

[mattbr]

have you tried equalizing the masses between the components by taking some cable (cinch works fine...) and touching a conductive part of each while keeping one tip in contact with the sugden's frame ?
(this solved my initial sugden humming problem...)

 

[gryphon1972]

I seem to have this problem with a sansui AU70 old tube amp....

The hum can only be detected at the headphone out....

I have tried all the methods listed above and even change the whole set of tubes....but its still doesnt help

At least Gergor can still contact Sugden......

 

[Gergor]

Quote:

Originally posted by mattbr have you tried equalizing the masses between the components by taking some cable (cinch works fine...) and touching a conductive part of each while keeping one tip in contact with the sugden's frame ? (this solved my initial sugden humming problem...)

Could you please explain a little bit more in detail about what needs to be done? I'm sorry I got a little confused about the explaination here. Thanks.

 

[PC Corp]

I think it's the grounding problem.

I had the same problem before with my SAC amp.
A local shop owner told me to ground the amp.

So I connected the amp and the window steel frame with a cheap speaker cable.
Then I stuck the amp a little bit out of the sill so the bottom of the amp will touch the sill.
Amazingly, it worked. (though I still don't know why)

Hopefully it helps.