I want ideas for a guitar amp - Page 1
Forum section: electronics / general

author: L3apr
author_rank: Newbie
timestamp: June 11, 2016, 04:24:00 pm
content: Hello! I am a average guitar player with some skill in DIY electronics and because i'm not an millionare and i cant afford an marshall head(amp) with cabbinet i want to make my own guitar amp,but i have an issue:i can't find good tutorials(with schematics,part list,etc.) And i wondered if anyone here can help me.P.S. Big eevblog fan and a huge fan of the Fail button XD

author: coppice
author_rank: Super Contributor
timestamp: June 11, 2016, 04:38:00 pm
content: Just Google "Vox AC30 schematics" or whatever your favourite amp might be. The classic guitar amp designs have all been around so long, schematics are easy to find.

author: Seekonk
author_rank: Super Contributor
timestamp: June 11, 2016, 05:06:39 pm
content: I've found that most of them don't use overall feedback in the output stage, just localized.

author: L3apr
author_rank: Newbie
timestamp: June 11, 2016, 06:59:31 pm
content: True

author: L3apr
author_rank: Newbie
timestamp: June 11, 2016, 07:05:56 pm
content: Quote from: coppice on June 11, 2016, 04:38:00 pmI already did that but the schematics for marshall and orange amps are really unclear

author: DaveHardy
author_rank: Regular Contributor
timestamp: June 12, 2016, 02:56:47 am
content: From what I've gathered from this post, you're not quite at the level where you're competent enough to make your own designs. I suggest this link below. Mojotone has some good kits that aren't cheap, but they will sound extremely good and last. My personal opinion, based on your lack of effort to find quality schematics, is that you'll never finish it if you try to build it from scratch.http://www.mojotone.com/kits-Dave

author: rhdf
author_rank: Contributor
timestamp: June 27, 2016, 06:13:47 pm
content: Quote from: L3apr on June 11, 2016, 07:05:56 pmA couple days ago I tore apart my old "trusty" Dean Markley K-50. It have been standing in a corner at my parents place for 10 years and when i got it back I realised that it sounded.. bad .Scratchy pots, annoying hum and crackling inputs. (hey its over 25 years old or so)I managed to find the schematics, but I start to realize that there is some differences in the actual circuit and the shematics. Some values differs, some components is missing (as in: not even a place for them on the pcb)so you really need access to a amp to be able to verify the design. In my case I suspect that there are 2 different revisions

author: Dan Moos
author_rank: Frequent Contributor
timestamp: December 26, 2016, 08:25:31 pm
content: Www.ax84.comis THE forum for homebrew tube amp builders.Some considerations. You won't save much, if any money. Tube amps are expensive to build compared with other hobby electronics.Also, you deal with extremely high voltages. Think 400v D.C. or more.That said, I went from electronics novice to designing relatively complex guitar amps in about a year, with the aforementioned forum as my main source of info. They are extremely well behaved there, and newbies are treated with respect at all levels. I think the Eevblog forum is pretty well behaved, and ax84.com is even better when it comes to treatment of beginners.Also, I can recommend one specific book that will get you really far. Get "Designing Tube Preamps for Guitar and Bass" by Merlin Blencowe. It's the book that got me going, and I can't recommend it enough. Best book on the subject by far, and i have them all. The author is very active on the ax84.com forum, and definately responds to beginners.Good luck. It's a great niche in the electronics hobby.

author: tautech
author_rank: Super Contributor
timestamp: December 26, 2016, 08:31:00 pm
content: Recent thread with schematics:https://www.eevblog.com/forum/projects/need-help-to-find-cause-of-buzz-in-a-fender-ab763-circuit/

author: boffin
author_rank: Unknown
timestamp: December 26, 2016, 09:28:11 pm
content: Quote from: L3apr on June 11, 2016, 04:24:00 pmUncle Doug has a nice 10 part series on youtube about building the "Uncle Doug Tremoverb"

author: Radio Tech
author_rank: Frequent Contributor
timestamp: December 26, 2016, 11:00:00 pm
content: You never clarified if you wanted tube or solid state. I have build quite a few scratch built tube amps from junk parts.I would suggest start by watching some of Uncle Doug's YouTube videos.https://www.youtube.com/user/Stratosaurus1You can build a Fender Tweed or Champ for next to nothing.

author: Luminax
author_rank: Regular Contributor
timestamp: December 27, 2016, 08:12:05 am
content: Quote from: rhdf on June 27, 2016, 06:13:47 pmrhdf : that's mostly the revision difference. In his case he wants to 'build' his own amp, ANY amp, I think.Anyway seeing as I'm a music enthusiast and an engineer myself (and have built some amplifier back in my youth)...First let's clarify :1) Do you need a guitar 'amp' or do you need a guitar 'amplifier cabinet'What's the difference you ask? it's the difference between "I want to build a car engine" and "I want to build a car"Most of the bulk price in guitar amplifier is actually in the speaker and cabinet, how they engineer those sound box criteria and tune them for certain frequency etc etc (For example, you'll find that most Accoustic guitar will 'ring' (ie resonate) at either a low A or low E)2) What type of amplifier, or more specifically, what kind of sound are you going after?I shall not delve into the whole amplifier class and the whole thingamabob, but suffice to clarify if you want a more or less faithfull reproduction of your amp sound (like most solid states amplifier do) or a little bit of a 'warm and fuzzy' sound (the characteristic of a tube).3)Will it be a stand alone amplifier (A barebone amplifier with just gain/volume control, and some crude passive tone filter for bass/mid/treble)? Or would you want a 'rocking' one with distortion/overdrive built into it and all whatever-you-want-to-whack-in (reverb, echo, 10-band eq, whathaveyou)And... after you've pondered the 3 above clarification point, let us then look at these few points :1) What is the extent of your knowledge in electronics?I know jack scrap about electronics when I built my first amplifier with a crude 8-Ohm midrange 5Watt speakers and some circuitry I found on elektor, but I do know or at least I do have sufficient knowledge (from being electrocuted at the young age when I poke the live socket with a tweezer...) to know that some parts requires playing around with mains voltage which can be quite fatal.2) How curious are you about the working beneath, that is, do you just want a working item, or are you interested to learn in the working of the item as you built them?3) How diligent are you in searching for an answer? (which, judging by the flow of this topic so far, is not a lot I guess)Aaaaaand I need to stahp ranting

author: BradC
author_rank: Super Contributor
timestamp: December 27, 2016, 12:53:20 pm
content: Check out the Aussie "Lamington" design. A guitar amp from off the shelf parts in a cake tin. Great starting point.