Problem with amp grounding

[faren]

I opened my amp because the sound suddenly switched to a much less powerful. I got it working but the grounding isn't right. I'm not sure where every cord should go, I'm confused with the colors and all.

img505.imageshack.us/i/p1010006o.jpg/ I don't know which one should be on the right and on the left.

img151.imageshack.us/i/p1010003zfu.jpg/ These are the same cords as above. The red one is connected to P2 and the blue to P3. I didn't touch these ones at all.

img370.imageshack.us/i/p1010007.jpg/ Don't have a clue which way these should be.

I'd really appreciate any help people can give. The amp is Gallien Krueger Backline 100. Manual: www.gallien-krueger.com/manuals/Backline100.pdf

[newey]

faren-

Hello and Welcome!

Sorry, but I moved your post here to "Amps", since that's what it is about.

You said that you got the amp working correctly again, but that "the grounding isn't right". What problems are you having, and what did you repair?

Your first photo is of the speaker wiring. Regardless of which way the speakers are wired, this has nothing to do with "grounding" the amp.

The other end of those connections, on the amp, you said you did not touch, so they must be OK.

Your 3rd photo shows a pair of what look like RCA cables. I'm not sure what these are for, but again, it's not related to any grounding issues as far as I can tell.

In short, we're going to need more info on your repairs of this and the remaining problem.

[D2o]

I am pretty sure those RCA cables would just be going to the reverb tank.

You haven't changed anything like the electrical outlet or extension cord you normally use, by chance?

[ashcatlt]

The RCAs are connected to the reverb tank. Since we can't see the markings on the tank, nor the other end of those cables, we can't say for sure which goes where. You might still get reverb out of it when connected backwards (since transducers tend to work both ways), but I'd imagine there'd be a noticeable difference in the quality and/or volume of the reverb signal.

Like newey said, the speaker connections have nothing to do with grounding. Assuming it's just one speaker, it shouldn't make much difference which way you've got these wires connected.

So yeah, "the grounding isn't right" is a hypothesis, but not a very good description of the problem. What symptoms are you having that lead you to this conclusion?

[D2o]

FWIW, I found this tidbit here in a "Backline Series" manual (i.e. it is not specific to the Backline 100):

In addition, a Ground (Gnd) Lift switch is included to remove hum and buzz when connecting to equipment powered by a different ground system.

Any such switch on your amp?

[faren]

Ok this is really embarrasing, I have no clue about electronics
When I started playing again, the hum sound was a bit louder than before and I think I got minor shocks during playing. My fingers were sweaty though. So could it be that I just imagined the problem being too nervous?

Thanks guys for helping me out

Is it possible that I wreck the reverb totally if I play with the cables installed the wrong way?

[D2o]

When I started playing again, the hum sound was a bit louder than before and I think I got minor shocks during playing. My fingers were sweaty though. So could it be that I just imagined the problem being too nervous?

Sweaty and nervous makes for bad first kisses, but it shouldn't shock you.

THIS COULD BE A VERY SERIOUS ISSUE.

You should try another outlet and if the condition goes away, have the outlet you are using now checked out. Seriously.

Is it possible that I wreck the reverb totally if I play with the cables installed the wrong way?

Probably the worst that would happen is your playing would either sound like the hidden Beatles track, or you may be chastized for cussin' when the echo is reversed.

Hello, ... oh, hell ... oh, hell