Gk backline 600 down

[Jimmy white]

I have a gk backline 600 I started to go over some songs when I started playing it sounded like my speakers were blown I thought it might have been my battery in my pick ups were going dead I changed it and it sounded the same I changed speaker cable un plugged my pre-amp went strait to the head same thing I took to my freinds plugged it into one of his cabinets same thing so I know it’s not my basses it’s not the speakers it’s the head making it sound like that if anyone has had this experience or knows what it could be I would appreciate it

 

[SpecialGr3g]

BUMP!

 

[Jimmy white]

Am I the only one with that problem just curious I would like to fix it but if I can’t that’s ok too

 

[delta7fred]

Am I the only one with that problem just curious I would like to fix it but if I can’t that’s ok too

Unless you have a good grounding in electronics then you are likely to do more harm than good poking around inside it. When you do take it to an amp tech he will have to sort out any faults you have introduced before he can fix the original fault, so the repair will cost more.

 

[Jimmy white]

We have a guy that’s a good tec but it costs 80 dollars to drop it off I gave a hundred for it when I bought it and gigged with it for 3 years so if it something major then that’s ok I feel I got my money’s worth if it was something simple I would fix it

 

[agedhorse]

If you don't understand electronics, then a GK service center is going to be your best option

If you do understand electronics, and have the necessary test equipment, what's stopping you?

 

[Jimmy white]

What’s stoping me is I’m not a tec if was something simple I would have it fixed by a tec sorry if you took that out of context I don’t give a poopie one way or another if it ever plays again if it cost to much I just play them I don’t work on them now you know

 

[Jaco who?]

If you never use the effects send/return jacks, you could try connecting them together and see if it helps. Often the switch contacts can get corroded. It's kinda the standard pat answer if you search around a little.

 

[Pilgrim]

What’s stoping me is I’m not a tec if was something simple I would have it fixed by a tec sorry if you took that out of context I don’t give a poopie one way or another if it ever plays again if it cost to much I just play them I don’t work on them now you know

Punctuation is your friend.

Best get it to a repair facility.

 

[delta7fred]

If you never use the effects send/return jacks, you could try connecting them together and see if it helps. Often the switch contacts can get corroded. It's kinda the standard pat answer if you search around a little.

I forgot about this, it is a fairly common fault on some older amps (old (UK) Carlsbo's were terrible for it) so is worth trying before you relegate it to a doorstop.

 

[agedhorse]

What’s stoping me is I’m not a tec if was something simple I would have it fixed by a tec sorry if you took that out of context I don’t give a poopie one way or another if it ever plays again if it cost to much I just play them I don’t work on them now you know

So if you don't work on them, your options are to get it repaired by a qualified service tech, stick it in a closet out of the way, sell it or recycle it.

I would try jumping the effects loop with a short shielded patch cable, you may be lucky and it's just an intermittent connection.

I don't think there was anything taken out of context.

 

[basscooker]

I had one of those given to me that produced no sound. The effects loop was the culprit. When your amp is powered down, cycle a cable into and out of the send and return a couple times. See if that clears up the problem.

 

[Downunderwonder]

Step 1, insert cable into the loop ie Send goes back to Return with no actual fx, just the cable.

Step 2, Turn on and play.

If that fixes it you can go to town inserting and removing a plug that has a little contact cleaner on it. Do not spray cleaner into the amp!

If that doesn't fix it you can take it to the recycling.

 

[Jimmy white]

Thanks for all of your input I was running into the effects loop when I started having that problem I have a ampeg preamp I was basically using the gk for power only I wondered if that might have caused that problem

 

[agedhorse]

Have you tried jumping the effects loop while using the amps own preamp?

 

[Jimmy white]

Have you tried jumping the effects loop while using the amps own preamp?

 

[Jimmy white]

I have I was using my ampeg pre amp I was running it through the effects loop I don’t know if that caused the problem or if it was going to go out out anyway

 

[agedhorse]

agedhorse said: ↑
Have you tried jumping the effects loop while using the amps own preamp?

What was the result???

 

[Downunderwonder]

New variables, the Ampeg preamp and the cable used to insert it make your trouble shooting logarithmically larger.

First test the loop per previous instructions. Use a different known good cable to the one currently in use.

If you can get another amp or something to test output of the Ampeg it would simplify the rest.

 

[delta7fred]

New variables, the Ampeg preamp and the cable used to insert it make your trouble shooting logarithmically larger.

^ This

Start with the simplest setup possible and change one thing at a time, otherwise you have too many variables to wrap you brain around.