I tried in one of my builds Merlin/Engl 12ax7 fx loop and i have loud hum only if i just plug guitar direct in return jack ,guitar volume at 0= zero hum ,from 1-9 loud hum ,on 10 hum is half loud. with delay,chorus,reverb in loop... no hum.
I changed tubes,tried new cable,guitars,new loop jacks,solder... Never heard this on other amps,i have no idea any more what to try.
Strange loop hum
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Re: Strange loop hum
Sounds like you have a grounding problem. Do you have a schematic or pictures of the loop?
Re: Strange loop hum
Have you checked for oscillation?
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Re: Strange loop hum
Are you ever actually going to play the amp like that, I would think not.
If you jump between the send and receive with a cable and there's no hum issue then call it good.
If you jump between the send and receive with a cable and there's no hum issue then call it good.
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Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: Strange loop hum
You are not posting any valuable info.. schematic, what did you connect and where , voltages.. which amp. Very basic description of the problem.Guitarxtc wrote: ↑Wed Feb 07, 2024 11:36 pm I tried in one of my builds Merlin/Engl 12ax7 fx loop and i have loud hum only if i just plug guitar direct in return jack ,guitar volume at 0= zero hum ,from 1-9 loud hum ,on 10 hum is half loud. with delay,chorus,reverb in loop... no hum.
I changed tubes,tried new cable,guitars,new loop jacks,solder... Never heard this on other amps,i have no idea any more what to try.
What i can see, 100% this is not normal