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MemphisMerv 6th July 2012 12:26 PM

Popping Crate GX-130C
 
Hi! I have a Crate GX-130C combo that pops quite loudly after it's been on for a few minutes. I see the channels switch on their own when it pops as well.

Any idea's, or suggestions? I'm quite handy with a soldering iron.

THANKS!

Osvaldo de Banfield 6th July 2012 02:00 PM

At first, change the electrolytic caps. One or more of them may be faulty, leaky or degraded. More important are coupling caps, and power supply ones.

MemphisMerv 6th July 2012 04:40 PM

would that be all the electrolytics on both the pre and power amp board? :eek:

Now that I've asked that question, here's another.....

I left the thing on, and noticed that the chorus section kicks in intermittently. I wonder if that has anything to do with this as well....:confused:

Granted I got this thing CHEAP (40 bucks) but I'm beginning to wonder if it's worth all the time/materials to mess with it...

Osvaldo de Banfield 6th July 2012 05:31 PM

Quote:

Originally Posted by MemphisMerv (Post 3083662)
would that be all the electrolytics on both the pre and power amp board? :eek:

I always replace electrolytics by a group of 5, no more with a switch on between any group. So if you do a mistake, are sure that it is in the last group.

Quote:

Now that I've asked that question, here's another.....

I left the thing on, and noticed that the chorus section kicks in intermittently. I wonder if that has anything to do with this as well....:confused:
Surely. coupling caps with leakage may have erratic job.

Quote:

Granted I got this thing CHEAP (40 bucks) but I'm beginning to wonder if it's worth all the time/materials to mess with it...

Ian Finch 6th July 2012 11:12 PM

Quote:

Originally Posted by MemphisMerv (Post 3083450)
Hi! I have a Crate GX-130C combo that pops quite loudly after it's been on for a few minutes. I see the channels switch on their own when it pops as well....

It seems a bit more than the usual problem with old caps. It is throwing logic controlled switches so there is likely quite a disturbance on the low level supply rails.

'Need a schematic, I'm afraid. Meantime, scope the preamp and main power rails if you can, to see if there is something going on there.

However, this might be interesting regarding connectors too.


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