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Questions tagged [guitar-amplifier]

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Roughly a year ago I foolishly decided to try to build this guitar amplifier from a site I found. Long story short, it doesn't work and I have a hard time understanding why. Circuit & test setup ...
Anamne's user avatar
  • 117
2 votes
1 answer
113 views

I'm trying to design a guitar tuner. I made a Schmitt trigger to get a square wave, then connected it to a monostable multivibrator to generate a PWM signal. By using RC filter I should get clean ...
Ege's user avatar
  • 31
6 votes
3 answers
570 views

The preamp and tuner on my guitar died, so I decided to make a new one myself. For the moment I am focused on the preamp. This is my preamp design (Scroll Down For Revised, Possibly Functional Version)...
erikor's user avatar
  • 207
1 vote
1 answer
108 views

I'm attempting to replace potentiometers in an old guitar combo amp. Here's how they look: Besides the usual three contacts, each pot has a mounting bracket with four more pins. They look and feel ...
Ivan's user avatar
  • 239
1 vote
0 answers
69 views

I'm building an effect looper for my guitar rig, so I can set multiple pedals in or out of the chain with a single switch. I recently got the idea to make the last two loops configurable to either ...
CatalinM's user avatar
  • 417
0 votes
2 answers
162 views

This is a continuation from a previous post. Read here if you have further questions. I have decided to makee a simple guitar amplifier with the circuit seen in the attached figure. What maximum value ...
Rahul Singh's user avatar
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1 vote
0 answers
148 views

I'm building a microphone preamplifier. I was having problems with hum (intermittent ground hum when touching the case) and decided to try adding an audio isolation transformer (600 ohm : 600 ohm) ...
steev's user avatar
  • 111
1 vote
2 answers
170 views

When connecting a guitar's output to an input with insufficiently high input impedance, the signal is undesirably filtered, which is referred to as "tone suck". To deal with this, it is ...
dannycbus's user avatar
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3 answers
1k views

Problem statement: I have 2 guitar amplifiers and I have 2 speaker cabinets that normally connect via speaker cables (1/4" connectors). I would like to create a passive device that lets me ...
Luther Baker's user avatar
  • 103
0 votes
2 answers
192 views

I have just started research and design on a small tube guitar amp and have hit the first of what is probably many uncertainties. The idea is to reuse the transformers, 7C5 power tube and 7Y4 ...
slubtle's user avatar
  • 3
0 votes
1 answer
172 views

I am looking to build a simple box, for fun, to switch the send and return signals from a guitar amplifier effects loop between two different amplifiers, depending on which amp I am using at the time. ...
jlbriggs's user avatar
  • 103
6 votes
3 answers
3k views

Hello electronics professionals and enthusiasts! Software engineer mingling with breadboards and discrete components in his spare time here. I'm trying to build a simple BJT amplifier for my electric ...
Alex's user avatar
  • 71
0 votes
2 answers
440 views

First of all I apologize, I am not an electronics expert, just fairly good at it, but now I am faced with this weird problem that I can't figure out. I needed to replace a transformer on a power ...
Zen Max's user avatar
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0 votes
2 answers
574 views

I have a 1x12 wedge cabinet I'm repurposing into a guitar speaker cab. It has a jack plate with two 1/4" mono jacks. What I'd like to do is reset the jack plate in such a way that it can: Run ...
kkitchen63's user avatar
  • 1
0 votes
1 answer
110 views

I am trying to convert my European 220V VOX AD50VT guitar amplifier into 110V to use it in the USA. I plugged it to 110V and it does not work, there's just the master light that comes up but it ...
user avatar
3 votes
4 answers
4k views

When I plug in my guitar cable by itself in the amp (without the guitar attached) it makes a bad noise. I changed the cables and the noise is still there in the amp. Also, when I plugged just the jack ...
Basheer's user avatar
  • 159
2 votes
1 answer
160 views

Looking at this whoknowswhat 100w amplifier on eBay. There are two trim pots, one is for bias current, and the other for "midpoint" adjustment. The schematic supplied does not show the ...
ITPhoenix's user avatar
  • 145
2 votes
3 answers
675 views

I have an old transistor (EDIT: not transistor, but OP, from comments) guitar amp, a Laney Session 45 Reverb. I couldn't find any schematics online unfortunately, it doesn't seem to be a very popular ...
C. Crt's user avatar
  • 121
2 votes
2 answers
220 views

Musical instrument amplifiers often have an "FX-loop" with a pair of jacks which can be used to interrupt the default connection between preamp & power amp, to put the preamplified ...
user1847129's user avatar
  • 203
4 votes
2 answers
2k views

I was wondering if it's possible for me to use the tubes in an old CRT TV to build an audio amp (specifically a guitar amp). If not, would I be able to salvage something else (like an old radio) to ...
Daniel Oren-Ibarra's user avatar
  • 77
-2 votes
2 answers
136 views

I was reading about the carver challenge,(https://www.stereophile.com/content/carver-challenge) and read that he had added a series of potentiometers to one of his amps that had allowed him to ...
Daniel Oren-Ibarra's user avatar
  • 77
0 votes
1 answer
649 views

I'm trying to connect a tube guitar amplifier to the Delta 1300 W battery pack by Echo Flo. The pack is not grounded, so I get a hum. Echo Flo suggested connecting the amp to a power strip, then ...
Island's user avatar
  • 9
2 votes
4 answers
1k views

I'm attempting to design a class AB guitar amplifier with a class A preamp. I'm a novice and this is the first actual project I'm attempting. What are the possible caveats, as well as my choice in ...
Daniel Oren-Ibarra's user avatar
  • 77
1 vote
4 answers
1k views

I have built the following electric guitar preamp which is mounted inside the instrument. The primary reason for doing is that there is a piezo pick up in the bridge with a very high output impedance ...
p-we's user avatar
  • 55
0 votes
2 answers
378 views

I'm trying to build a simple amplifier for my guitar. I created the exact same circuit as a common-source amplifier, I biased it on the necessary Q-point, and AC signals are decoupled. It worked ...
user avatar
1 vote
1 answer
174 views

I've been attempting to make a very basic guitar/condenser microphone amplifier for a long time, and I think I'm getting close (this is the first time I'm reaching out for help on the matter). I'm ...
Aaron R.'s user avatar
  • 19
0 votes
3 answers
407 views

I built a Fender 5f1 Champ imitation. I've taken care to start it up gradually (first with no tubes, then just the 5Y3, then the 12AX7, then the 6V6 with the speaker connected and finally connected a ...
user3209815's user avatar
  • 187
0 votes
1 answer
942 views

My amp is a Blackstar core id 40 and has info in the back that says "Use 16V/3.5A DC Power Supply". I'm confused on this part though if it refers to dc being the input or a dc adapter. Found ...
tsalcet's user avatar
  • 3
-1 votes
1 answer
1k views

I'm designing an amplifier which is to be run off of a single 20 V supply (in the circuit, V+ = 20 V, V- = GND). Q2 and Q3 are used to bias Q4 and Q1. Since the circuit is running off a single 20 V ...
Steve's user avatar
  • 90
0 votes
1 answer
1k views

So I finally finished building my guitar amp. It sounds great, except for one thing that occurs when gain is too high. What happens is that when I turn one of the preamp volume pots high enough ...
J K's user avatar
  • 167
1 vote
1 answer
239 views

I'm trying to design a guitar distortion pedal, though it is not working as expected. The built circuit behaves differently than the simulated LTspice model. I currently do not have access to a scope, ...
Steve's user avatar
  • 90
8 votes
3 answers
3k views

I have read that the preamp boosts the signal so that it is strong enough to send to the power amp section, but it seems like there must be more to it than that. Two thoughts I have had: The preamp ...
markv12's user avatar
  • 249
1 vote
1 answer
313 views

I found a guitar preamp on the web after trying to build one myself and having no luck. This one works for a bit, but the offset part of the OP-amp slowly depletes. It's like C1 is charging up really ...
Jacob Lara's user avatar
  • 153
0 votes
0 answers
76 views

I have a Firebird electric guitar with two mini humbucker pickups. Both pickups have been good since I got it, but suddenly the bridge pickup stopped working. The neck pickup is fully operational, but ...
haydnwarne's user avatar
  • 1
1 vote
1 answer
315 views

A friend has asked me to take a look at his guitar amp: Peavey Valve King VK212. Problem: suddenly the amp stopped working during operation and the status lamp went off. First reaction: fuse ...
Piotr Tyburski's user avatar
  • 131
1 vote
3 answers
545 views

I have a Fender Frontman 25R and I would like to use the reverb send and return as an effect loop instead. I don't mind getting rid of the reverb tank of the amp. So I found the schematic of the amp ...
Nicolas's user avatar
  • 11
0 votes
3 answers
641 views

I'm still trying to understand the theory of audio signal processing, namely guitar amplifiers. The main thing that got me started down this path was a broken amp that I have. I have since figured ...
ChronoLogic's user avatar
  • 63
1 vote
2 answers
518 views

I don't tend to post questions on online forums so I apologise in advance if I've messed up here. I'm currently trying to work on an old transistor guitar amp and in taking measurements managed to ...
Green_spleen's user avatar
  • 13
1 vote
1 answer
84 views

With a Guitar amplifier's Headphone out jack, I need to attenuate the signal about 80%, adjustable. Would a 1k Audio Taper Pot be my best choice? I am attempting to use the headphone outs of my 2 15 ...
SelfStudent's user avatar
  • 11
1 vote
2 answers
720 views

I've been repairing an old (~1982) Fender solid-state guitar amp. While I had it apart I took the opportunity to replace some of the RC4558 op amps with NE5532's in DIP sockets I installed. It was ...
Rob Lewis's user avatar
  • 299
3 votes
1 answer
753 views

If I am using a CMOS switch, how much do I have to slow down the switch time so that I don't experience a pop in my audio signal out of my amplifier and how would I accomplish that? The switch time ...
Ryan Jaquin's user avatar
  • 31
3 votes
1 answer
971 views

Background: I'm in the process of restoring a HIWATT HI-GAIN 50 COMBO Valve guitar amp and one of the issues it has is that the reverb dial has no effect on the sound. Attempted troubleshooting: ...
andowt's user avatar
  • 1,038
6 votes
2 answers
2k views

I have a Fender Deluxe Reverb Reissue guitar amplifier that hums whenever I turn on the reverb. It sounds like loud 60 cycle hum. The reverb effect is still applied, but is accompanied by the hum. ...
Avid Pro Tool's user avatar
  • 511
12 votes
7 answers
16k views

I have a Fender Telecaster that hums loudly--much more so than other similar guitars. It's a standard Tele with single-coil pickups. The humming noise stops when the player touches the strings or ...
Willis Blackburn's user avatar
  • 1,257
1 vote
3 answers
257 views

I have a circuit that implements a guitar amplifier (I ordered a couple LM386 but in the meantime I used an OP484). The following figure represents my schematic: (cap C2=10uF as well) The signal from ...
Marco Castro's user avatar
  • 199
1 vote
0 answers
253 views

simulate this circuit – Schematic created using CircuitLab In the above circuit I have created a JFET amplifier for small signal purposes. When I run tests on the circuit, i get this weird ...
ForeverLearningJP's user avatar
  • 47
0 votes
1 answer
267 views

I ordered Marshall DSL1HR valve guitar amplifier head. As you can see in specs it has built-in "Emulated line output". I know that a valve amplifier must be running with a speaker cabinet attached. ...
netanalyzer's user avatar
  • 103
1 vote
2 answers
140 views

I assembled a tube amplifier.According to the specified scheme (Old Russian radio "Record 66"). 1.What is the function of capacitors C9 and C8 ? 2.What will change the capacity of these parts? Will ...
Gen Ts's user avatar
  • 113
0 votes
2 answers
440 views

I'm not quite sure how level and impedance bridging works so I am hoping for an illuminating answer! I'm generating audio with a PCM5102A DAC. The datasheet of the chip specifies a 2.1V RMS output ...
Jeremiah Rose's user avatar
  • 429
0 votes
1 answer
168 views

I have an Epiphone Wilshire that is producing a "static" sounding noise when plugged into an amp. I removed the cover plate and found a loose, black wire (ground?). It looks like the wire is connected ...
user2276280's user avatar
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