I really dont understand most of what your saying.....sorry...

There isnt sudden crackles in the signal, theres just a crackle when its turned on and when a lead is inserted. Ive shaken all of the pots, it still dosent crackle.

Yeah, the amp has a master volume pot, if that helps..

I played one of the 30watts, and then a 75watt, and i didnt notice much difference in the way of tone. Of course, if you crank up the 30watt, itll break up, but overall, i quite liked the amps. If i were you, i would save up a little more for a spider 3 though.

Ok, ill try that. Wait, what do i plug into the FX loop? The guitar?
It dosent look like theres any solder problem, everything looks fine. Is there any chance its a prob with the transformer?

Ill try that with the effects loop anyway.
I plugged headphones into the headphone port, nothing. I plugged an mp3 player into the cd in, and nothing...

So, was at practice yesterday with my band, and whaddya know, the MG cuts out. Its a marshall mg100dfx, and just wont produce any sound. Has anyone got an idea on how to fix it? I took out the chassis, had a look around, nothing seems to be wrong. Had a look at the speaker, nothin wrong there. Of course, i could have missed something.....im not a genious at electronics. Perhaps something happend the transformer? As it was in a cold room for quite a while?

The amp turns on, ie, the lights come on, the fan whirrs.....blah blah, just no sound comes out. Ocassionaly, i get a click or a buzz as i plug in a cable, but just for a split-second as its plugged in. Any ideas?

Ah, okay. Well, im willing to help out with whatever, i have plenty of time at the moment to do some stuff, so if you want, im here to help.

Aw *s!!t*. Is there any chance that more could come in?

Hi! Ive been gone for 3 weeks, just getting back into the swing of my amp now. I have the whole enclosure ready, the plywood cabs are ready, and theres plenty of space for that PCB on an aluminum enclosure. Unfortunatly, i dont have a camera at the moment, so i cant take pictures.

Joecool85, did you get those chipamp PCB's, im still very interested in getting one! Thanks a lot.

Ill keep checking, im off school at the moment, so i have plenty of time. Thanks a lot man!!

BTW, where could i get these components for that^^^? Im a poor guy, little money (only 16...) so i would probably have to buy the components somewher else.

Quote from: joecool85 on April 22, 2006, 09:27:48 PM
Well, it won't be plug and play so to speak, but if you are careful, you should be able to use all of your preamp stuff from the old amp (I'm assuming it works), then put in a LM4780 for 100w of power.  You can buy a PCB for that at chipamp.com, but if you wait a little while I might be able to get you one just for the cost of shipping.  Brian is sending me some to distribute here.

Wow, i would definitly be interested in the PCB, thanks very much!!! Can you email me with info to:
born2lose_out2lunch@yahoo.co.uk

So, i wanna build a 100watt amp. Its just a simple affair, im ripping the guts out of my 10watter, putting in new electronics, and putting in new electronics. I plan to put a ~70watt speaker into it, and then using the enclosure of another 10 watt amp for a makeshift "cab" to put a 50watt speaker into it. I plan to put in celestions, or peavy speakers. But, i have no idea of what schematic to use. Hopefully one of you can give me a link to a schem, with a parts list, and also where i can buy a ready-etched PCB for it. Im looking for a simple schem, not too hard to build, this is just going to be a learning experience.



^^thats the amplifier im gutting.