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Topics - slimjohnny

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First off i'm a guitar (and amp for that matter) noob.

So i'm making a 30 watt solid state combo as my first amp and i've checked a lot of diy schematics and that gave me an idea on how mine is going to look like. All the schematics i saw were similar, preamp with tone controls and the poweramp. But then i started looking into schematics from marshall and the preamp had more two ICs than the other diy circuits so i did some research and those two IC's behave as a low pass filter.

Now that got me thinking: is the low pass filter really necessary when you already have controls over the frequecy(eq)?. Is it normal for amps to have this? And why did none of the diy schematics that i saw have this low pass filter?

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