DIY Audio Projects Forum

Guitar amplifier ?
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Author:  tjolle62 [ 17 Dec 2017, 14:30 ]
Post subject:  Guitar amplifier ?

I have in progress of thinking to build a guitar amplfier in around 50W range and now i wonder what is the difference
between a guitar amp and a (regular) amp ?
I do have a bunch of schematics in a varity of mono amps in by binders but they are for mono Hi-Fi's ,
only thing i know for sure at this moment it's a 12" guitar speaker element i have laying around rated for 100W 8Ohm,
i also bought a guitar pre-amp pcb with a varity of functions so what i need is a amp to go with that.


Author:  gofar99 [ 18 Dec 2017, 18:13 ]
Post subject:  Re: Guitar amplifier ?

Easy question IMO....Hi-Fi amps try to minimize all distortion. Guitar amps emphasize some types of distortion.

Good listening

Author:  laurie54 [ 19 Dec 2017, 00:41 ]
Post subject:  Re: Guitar amplifier ?

Another distinction is that a 50 watt HiFI amp will normally only be running at a small percentage of that value since it is reproducing the full band playing the music. The brain thinks it is louder. A guitar however would be asking the amp to reproduce individual notes which are perceptively quieter thus needing more volume. Also a sustained note on an instrument will use more power for a longer period of time than most music over the same time period.
This all depends of coarse on what type of music one listens to and how loud. There are of coarse, exceptions to every case.

Author:  tjolle62 [ 19 Dec 2017, 16:05 ]
Post subject:  Re: Guitar amplifier ?

Thank's your answers guy's,
this amp is just for testing and playing around with theremin's and that's why i went to a (guitar amp) so when testing i just
plug power and a signal and it's ready to go so in this case i'm pretty sure i have a suitable schematic to build on.

Author:  ILoveHiFi [ 23 Dec 2017, 15:02 ]
Post subject:  Re: Guitar amplifier ?

You can go cheap by getting solid stage output for amp.
Then get a valve pre amp to get some taste

Author:  Geek [ 24 Dec 2017, 01:46 ]
Post subject:  Re: Guitar amplifier ?


There's some great music amp related schematics at and the people there are (nearly) as awesome as we are for help :D


Author:  tjolle62 [ 04 Jan 2018, 06:00 ]
Post subject:  Re: Guitar amplifier ?

Hi Geek and Thank you for the link regarding amp's and stuff.

Author:  laurie54 [ 04 Jan 2018, 18:44 ]
Post subject:  Re: Guitar amplifier ?

Electrically a guitar amp and a HiFi amp are the same piece of equipment. Due to the usage however most guitar amps are mechanically overbuilt, (heat, vibrations, and mechanical jarring from always being on the move), in short, the main usage is much more demanding. There are exceptions to every rule of coarse. Constantly on the move for a guitar amp goes without saying. On the HiFi side of it, we in this community I think, represent the largest portion of people who move their amps from place to place.:)

Author:  Yungman [ 18 Jan 2018, 03:46 ]
Post subject:  Re: Guitar amplifier ?


Author:  Yungman [ 05 May 2018, 05:06 ]
Post subject:  Re: Guitar amplifier ?

Guitar amps is very different from hifi amps. Guitar amps work on distortion that make the guitar sounds good. Hifi amp are lower THD. They don't sound good at all if you reverse the role of usage.

You run guitar amp in distortion region, even the clean sound has a lot of distortion. If the amp don't have distortion, it sounds really bad for guitar. It sounds dead. Most guitar amp actually run at clipping, we call natural distortion. In hifi amp, you never want to run into clipping. You need higher power for hifi amp to get more headroom to avoid clipping. You want lower power guitar amp just enough for the venue.

As a guitarist and designer of both guitar amps and hifi amps, I designed my guitar amp at about 30W. Any higher power would be too loud to get to the optimal level. The level is about the same as Fender Vibrolux Reverb. I used Fender Deluxe before, I kept wanting a little more. I owned a Marshall Plexi 100W and Twin Reverb, they are way too loud, I had to pull two power tubes to lower to half power to use. Still, it's loud.

For hifi amp, I won't do anything less than 50W for 8ohm.

Notice I avoid talking about tube vs SS, that's another can of worm.

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