It just now dawns on me that I have no idea what happens.
When bands use to run two amp heads together...jump the input jacks of two separate amps (like in an old Hendrix video) .....what happens exactly.?
Does it just become a Big A-B box, or do the controls of one amp mingle with the other...each head is plugged into its own cabinet...right.?
Thank You
Basically you are splitting the signal from the guitar and it is going part to one amp and part to the other. There should be no crosstalk of controls. I have done this with two channel amps and used both channels at once as long as they are in phase or identical channels.
OK...that is what I thought...but I have never actually heard it before.
So it was primarily a way of getting more Power/Volume for a larger venue.
Thanks
You,ve heard it millions of times when you listen to your stereo, be it in your car or at home it's the same thing, two Amps and two or more speakers getting fed the same signal at times!
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Reeltarded wrote:You lift the ground on the amps that create the loop. Same as a multi amp switching rig. In that case the dirtiest amp is grounded as the master.
God Help Me...I am somebody that needs pictorials to learn anything.
So you connect amp A to amp B.....and you hear a ground loop.
So you lift the signal ground to amp B...I assume at the in jack...why does THAT not break the AC (guitar signal) circuit in amp B.?
Thank You
Plug all amps into the same distro and lift the ones that loop with a $2 piece of crap. It's way cheaper and doesn't take up rack space. I have never been bitten.
Signal isolation only sounds worth a damn with a Lucas Deceiver. You don't want to afford it. My opinion and I am a complete asshole.
THAT ARTICLE IS 100% BULLSHIT. It's gear driven fear. If one amp is grounded and everything is on same distribution its GROUNDED, whole rig.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
Any amp that hums is lifted. The dirtiest amp is always grounded. All amps ground through signal connections to the dirty amp. The cables aren't going to pull. Even if the dirty amp melts it's still ground. The ground is not fused. Switches (ABY) don't lift the ground, they lift the signal.
The signal wires are bundled and they tie at both ends with a cable loop and a bent arm's length of slack. It's a serious consideration. I have tried every possible scenario. This one requires a little bit of method instead of another piece of gear. Or, you can find a Lucas.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
You're right, I should have thought a bit before posting that article. Thinking about it the only way you could possibly get shocked is if you decided to unplug your guitar from the ungrounded amp and for some reason decided to touch the end of the plug whilst touching a grounded object.
I would personally however feel better about using a proper device to solve the ground hum issue rather than lifting the ground from one of my amps. But I don't have to worry about that for a long time as I'm still playing through a 2x12. Once I have 2 x 4x12 Cabs on stage and need more volume THEN I'll think about having a second amp .
You still don't get shocked unless you are better potential, ie; standing bareoot on cement.. in water.. like that. Kiss an other phase mic.. stuff like that.
IF you unplug the drain (grounded amp) the grounds are floating and in a poorly wired situation I give it about a 70% chance that you'd never know, 30% chance you get at least a tiny bite or better. (worse)
Because we are talking about the common... not the neg phase of juice.
Everything outside the wall is pretty much idiot proof. I bet you the stuff inside the wall was installed.. by.. someone borrowing a license to practice wiring though. I BET. never take that part for granted. Always test with the test plug thingy.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
The problem with this is that one amp will only be connected to ground via a series of instrument cables and jack sockets.
These aren't rated for / capable of conducting fault current, eg if the power transformer shorts and sends line voltage to the chassis / input jack shield.
If the only link to safety ground is at the far end of > 30ft of instrument cables, jack contacts, PCB traces etc, then it's likely that the weakest link in that chain will blow when passing tens of amps of line current.
In such a circumstance, the whole pedalboard / guitar metalwork / musician could get pulled up towards line voltage.
In the light of the above, I hope that it is now apparent that such a tenuous connection to ground is unsuitable for maintaining electrical safety.
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