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Need to take amp in after I somehow buggered it up [message #16049]

Fri, 09 September 2011 18:42

RickBlacker
Messages: 133
Registered: October 2008
Location: Oregon

Senior Member

A while back, I got a bit over achieving, I decided to replace all the caps in my K100C-8 amp, both preamp and power amp sections.

Amp works and sounds fine, but, after a few minutes it produce a loud pop. It does not do this just once, it will repeatedly do it.

Not sure exactly what I did, but probably should take it in to have it looked at. I suppose my question would be, anyone have any rough estimates at how much this could cost me to have diagnosed?

Also does anyone have any recommendations where to take it in the Portland Oregon area?

My amp : K100C-8

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Re: Need to take amp in after I somehow buggered it up [message #16050 is a reply to message #16049]

Sat, 10 September 2011 11:44

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

One way to do a simple check of where the popping is steming from is to disconnect the blue output wire from each preamp board one at a time.
Doing this will let you pin down if its coming down the audio stream from one or the other preamp board.
You should go over all the caps you replaced as some are of the electrolytic type and must be installed with the + marked end of the cap in the right position.

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Re: Need to take amp in after I somehow buggered it up [message #16051 is a reply to message #16050]

Sat, 10 September 2011 11:58

RickBlacker
Messages: 133
Registered: October 2008
Location: Oregon

Senior Member

Agreed... I was thinking about disconnecting both preamp boards first.. Wanted to see if I messed up a cap in the power amp and try to isolate things.

I'll go back and see if I can find the cap I put in backwards. What about the possibility that I put in the wrong value of cap? Would that cause a pop?

My amp : K100C-8

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Re: Need to take amp in after I somehow buggered it up [message #16053 is a reply to message #16049]

Sun, 11 September 2011 10:56

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

only if the cap was of too low of a voltage rating.

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Re: Need to take amp in after I somehow buggered it up [message #16055 is a reply to message #16051]

Sun, 11 September 2011 19:26

RickBlacker
Messages: 133
Registered: October 2008
Location: Oregon

Senior Member

Yesterday I took the amp section out of the cabinet and poked around... I think i may have fixed it, but I have to tell you what I modded first.

I have a Boss GT10 guitar processor. I wanted a way to go directly from the processor to the power section of the amp. So, on the top left input, i modded it such that that input jack goes directly to the power section. Also, rather than unsolder what had already been in place, I simply took unscrewed the existing jack, bent it out of the way and put a comletely new jack in it's place.

So, what I think was happening was that the jack that I had unscrewed, and bent it out of the way may have been making contact with the chasis or something. I took it, wrapped it up with electrical tape, plugged it all back in. Not a single pop, nothing. Sounds great and is performing just fine.

Having said that, I'm still going to keep my eye on it.

My amp : K100C-8

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Re: Need to take amp in after I somehow buggered it up [message #16056 is a reply to message #16049]

Mon, 12 September 2011 07:41

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Those kustom driver/power sections take about 5 volts to drive to full output, is the pedal providing enough output for you to get the volume level you need/want?

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Re: Need to take amp in after I somehow buggered it up [message #16061 is a reply to message #16056]

Mon, 12 September 2011 13:09

RickBlacker
Messages: 133
Registered: October 2008
Location: Oregon

Senior Member

Hi Steve,
Off the top of my head, I'm not sure. I can check the manual when I get home, but I can tell you that the Boss GT10 seems to provide MORE than enough UMPH. Minimal volume on the GT10 get the Kustom ROCKEN loud! I've never had the volume up past maybe 1/4 of the way, if that.

My amp : K100C-8

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Re: Need to take amp in after I somehow buggered it up [message #16064 is a reply to message #16061]

Mon, 12 September 2011 17:56

pleat
Messages: 1452
Registered: June 2004
Location: Belding, Mi

Senior Member

Another thing to consider on the GT 10 is each patch's input and output gain. I run an old Digitech RP1 and the input and outputs on the processer I run at 10:00 o'clock and using a K50 I never run the volume control past 9:00 o'clock and have never had any problem with not being heard. You may want to try the GT10 in the normal channel, it will give you a fatter fuller tone than the bright effects channel.
pleat

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Re: Need to take amp in after I somehow buggered it up [message #16065 is a reply to message #16064]

Mon, 12 September 2011 18:01

RickBlacker
Messages: 133
Registered: October 2008
Location: Oregon

Senior Member

Hi Pleat

Actually what I did on that channel is to re-wire it so that it completely by passes the preamp all together, I wanted to go directly from the GT10, directly into the power section. So the way it is now, none of the preamp controls do anything when I plug into that jack. All tone and volume is controled on the GT10 itself.

My amp : K100C-8

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