Question about Crown CE1000 2-Channel Amplifier

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Gallien-Krueger 1001 RB bass amp problems

So I have had this head for about 7 years and all of a sudden it just **** out on me.....it fades in and out i have tried numerous cords and such and replaced the battery in my bass a few times....but to no avail nothing has worked out i brought it to a music shop and they said they tested it charged me $70 and found no problems.....weird......so i opened up the amp looked inside and wow not a single speck of dirt or anything inside.....anyone know how to fix this problem....???

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  • Anonymous Dec 31, 2008

    My 1001RB does the same thing. I use it with a Ampeg 410 cab and I 've tested it with a Ampeg 810 cab. Same problem: fade in and out.

    What is the next step?

  • Anonymous Jan 20, 2009

    yeah I've just notice my 1000 rb doing the same thing..i'vebeen playing recently thprugh a 2x12 gk cab and use that thick speaker cable.speakon..and started getting the problem of fading in and out..

    i use to play the same head thru a swr 4x10 and didn't have that prob..so might be cab


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Try using a short patch cord from the effects send jack to the effects return jack. There are contacts in the effects return jack that interrupt the signal to the power amp. When that connection corrodes it can cause all kinds of strange troubles.

Posted on Oct 26, 2009

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Hi richiebones


Dont you hate that when yo rig does what it wants, and probably in the middle of a gig too!! what sort of cab are you using with it,and did the shop test it also? Waiting you reply

regards
Graeme

Posted on Apr 06, 2008

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I have a gallien kreuger backline 600 bass amp head . and I'm wondering how to use the effects loop send and return jacks with a pedal or processor ?


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It's probably not your outlet, but try to get it into another one so you are sure.
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I'm afraid it sounds as though the speaker has been overloaded. The replacement for this will, unfortunately, be a new driver (the speaker unit itself).

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I just bought an 800RB (been WANTING one for DECADES, finally put "cash-on-hand" together with "the SWEET one came along"). I want to know if the speaker jacks for the 300-watt amp are...


Here is the schematic AND everything you need to know about the speakers:

http://elektrotanya.com/gallien-krueger_800rb_sm.pdf/download.html

Scroll down to "Get Manual" on the site and click on it to download. It appears that the MINIMUM impedance on the trebel upper set is 8 ohms and MINIMU on the woofer is 4 ohms at the jack in each case.

Apr 26, 2011 | GallienKrueger Gallien Krueger 800rb

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I have a Gallien Krueger Backline 600 head rigged to a GK Blackloine 410 BLX-II cab. There is a crackle sound emitting from all the speakers, so I'm guessing there is something wrong with the head. Have...


i) If the crackle is there with all input signal cables removed, then likely to be the head.

ii) Does the crackle vary noisily with control settings? If so, move noisy control to & fro about 10 times to wipe any dirt from internals (temporary solution).

iii) If ii) is not a problem, then tap head casing to check whether a dry solder joint or poor internal connection is the cause. Was unit dropped?

iv) If none of the above, then suspect possible component breakdown.

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I would like to buy and convert a Gallien Krueger 800RB bass head from 110Vac to 240Vac operation. Do the new ones have multi tap primary windings at the transformers that can be converted to accept...


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Dan

Nov 02, 2010 | GallienKrueger Gallien Krueger 800rb

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MY GALLIEN KRUEGER 800RB TURNS OFF


If you drive it too hard or block airflow, it may be protecting itself against overheating by turning off.

Sep 16, 2010 | GallienKrueger Gallien Krueger 800rb

1 Answer

Last weekend while I was playing, I smelled that smell. After I turned my 800RB bass amp off I saw smoke coming out of the foot switch input so I hooked up my spare amp. When I took the amp apart I found...


They are NOT called motherboards, just circuit boards.

Sometimes the board can be restored by carving out the black and re-insulating it and repairing the cause and bad components.

Likely the power transistors have shorted that are associated with that side and burned compnents.

Many shops will only replace the whole board rather than do the labor to restore the board... Yes, either way it will be expensive to repair.

Causes of these failures can be overdriving the amp. bad speakers and or cables. Loose speaker connectors that vibrate can lead to this.

Another problem can be if SUPERSONIC (can't hear it) feedback is occuring at high frequencies that overloads the amp.

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1 Answer

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Starting point is to open the unit and verify first that the +/- 60 volt power supplies and the +/- 85 volt supplies are producing.

Next check the +/- 15 volt regulators.

You will likely find one or more of these supplies are defective.

Cause could be blown parts or cracks in circuitboard or bad wiring.

Jul 12, 2010 | GallienKrueger Gallien Krueger 800rb

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