Recommandations for a simple DI box to solve a ground loop

[vibrasonic]

I need a DI box to solve the ground loop i'm getting when i plug my vintage fender reverb tank (6G15 with grounded AC cord) into my amps. Something that just lifts the ground would be nice.

Thanks

['58Bassman]

I need a DI box to solve the ground loop i'm getting when i plug my vintage fender reverb tank (6G15 with grounded AC cord) into my amps. Something that just lifts the ground would be nice.

Thanks

No, you need to address the ground loop properly. Lifting the ground can put you in line to conduct AC current and that's how people die.

[Chris Scott]

Y'all can check me on this, but if I recall, all you should need is a power strip and a ground lift adaptor.

Plug (grounded, of course) amp into power strip. Plug rev. unit w/ ground lift adaptor into same strip.

Connect all cabling, and you should be gtg - you're are grounded, as the amp is still grounded.

[mach90]

there is a difference between lifting the audio ground so solve a ground loop and lifting the ground from the power cable

Never lift the ground on the power supply

lifting the ground from and audio cable is fine and more often than not will solve ground loop issues.

Alll you need to do is open up the jack plug and desolder the braided sleeve of the cable from the jack sleeve then trim it back and insulate it so it can not make contact with the jack plug,

[pdf64]

Plug (grounded, of course) amp into power strip. Plug rev. unit w/ ground lift adaptor into same strip.
Connect all cabling, and you should be gtg - you're are grounded, as the amp is still grounded.
That's ok until the reverb unit develops a fault that allows line current to the chassis. With a ground lift on the power cable, the unit is only getting grounded via the instrument cable between the reverb unit and amp.
Instrument cables aren't specificied to conduct line fault current, and it would probably just blow open circuit.
That leaves the reverb unit chassis, your guitar strings and you, at line potential. The moment you then touch something at ground potential, eg a mic, bad things happen.
It's kinda reckless to lift a power ground; of course probably everything will be fine, maybe just you that get electrocuted, maybe also someone that comes to your aid (without taking precautions).
Pete

[vibrasonic]

there is a difference between lifting the audio ground so solve a ground loop and lifting the ground from the power cable

Never lift the ground on the power supply

lifting the ground from and audio cable is fine and more often than not will solve ground loop issues.

Alll you need to do is open up the jack plug and desolder the braided sleeve of the cable from the jack sleeve then trim it back and insulate it so it can not make contact with the jack plug,

I tried lifting the ground from the cable and it actually made it worse.

[oldhousescott]

Ebtech Hum Eliminator HE2 (http://www.ebtechaudio.com/hedes.html)

[Chris Scott]

That's ok until the reverb unit develops a fault that allows line current to the chassis. With a ground lift on the power cable, the unit is only getting grounded via the instrument cable between the reverb unit and amp.
Instrument cables aren't specificied to conduct line fault current, and it would probably just blow open circuit.
That leaves the reverb unit chassis, your guitar strings and you, at line potential. The moment you then touch something at ground potential, eg a mic, bad things happen.
It's kinda reckless to lift a power ground; of course probably everything will be fine, maybe just you that get electrocuted, maybe also someone that comes to your aid (without taking precautions).
Pete


Thanks for that Pete, good to know - I wasn't aware that there's a way that a Fender unit could develop this scenario - safety first!

[vibrasonic]

Ebtech Hum Eliminator HE2 (http://www.ebtechaudio.com/hedes.html)

I got the humx that you plug the offending gear into (my 64 fender reverb unit) and it worked like a charm, no more hum , quiet like a church mouse . Highly recommended if you have a ground loop.


4.517 Reviews


Thanks oldhousescott