Marshall Origin FX loop - more hum when engaged - any remedy for this?

[Larioso]

Hi

Thought I open it up, but might void warranty still there, so if knowing it helps would be good.

Did anybody do rerouting of some cabling or something that can fix this?
I get too much extra 50 Hz hum engaging fx loop.

Or did they do a real simple foot control and signal goes all the way to control and back and not relay controlled?

Thanks.

 

[Larioso]

Re: Marshall Origin FX loop - more hum when engaged - any remedy for this?

Pic on inside if anybody did something that helped
https://img.webme.com/pic/c/cloudmanfilms/originicb_n.jpg

 

[ehdwuld]

Re: Marshall Origin FX loop - more hum when engaged - any remedy for this?

speaker cable in the fx loop?

I did that once
looked like a patch cable

 

[Larioso]

Re: Marshall Origin FX loop - more hum when engaged - any remedy for this?

Yes, it is tricky to see difference speaker cable.
No, not in this case.
But thanks for idea.

Not sure if they possibly make the foot control so signal goes all the way out and back again, but not sure yet. Am to investigate.
I mean if they saved on the relay.

 

[devastone]

Re: Marshall Origin FX loop - more hum when engaged - any remedy for this?

What do you have in the fx loop? What kind of adapter are you using? Are you using the same adapter for pedals in front of the amp and in the loop (yeah, I've had that be a problem before)?

 

[Larioso]

Re: Marshall Origin FX loop - more hum when engaged - any remedy for this?

Thanks.
I use Gator G-bus-8 for floorboard, but separate for fx loop. I think Gator is separate ground for each, if I'm not mistaken so should be able to use I think.
Tried a couple of pedals, and cables too.
One cheap pedal increased hum quite a bit if putting it on top of amp, used a separate 9V 0.5A so well overpowered - but seemed not well shielded.
But currently I put unused EHX Blackfinger which has it's own power supply too.

So no ground loop thing, I think.

But test I have to make is what I picked up today reading - just make a cable over fx loop and see if the same sound.
This could show if signal is routed out maybe.

Also testing fx loop on, without anything there - is another one that might show if any different - it should be shortcircuited but one never knows.

EDIT: Put longer cable in fx loop, 60cm was enough, so I could move pedal away from amp in other direction where it was.
And solved, it's so low 50 hz hum that if really turning amp up you hardly notice.

 

[devastone]

Re: Marshall Origin FX loop - more hum when engaged - any remedy for this?

Glad you got it sorted out.