Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [guitar-amplifier]

65 questions
11
votes
7 answers

Fender Telecaster guitar makes loud humming noise, stops when player touches strings/metal parts

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 other metal parts of the guitar. The guitar is…
Willis Blackburn
  • 1,217
  • 1
  • 13
  • 24
8
votes
3 answers

Why do most guitar amps have a preamp and a power amp section?

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 generally has the EQ controls on it, maybe…
markv12
  • 249
  • 1
  • 7
6
votes
2 answers

Troubleshooting Hum in a Tube Guitar Amp

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. Here's what I've observed about the hum: -It only…
Avid Pro Tool
  • 501
  • 3
  • 14
6
votes
2 answers

What is simpliest possible guitar active preamp design

I want to build guitar active preamp inside my bass guitar. It has 2 humbacker pickups (3.4kOhm DC resistance each) for 2 lower and for 2 upper strings, and i want to preamplify each with a separate preamp, so i choose TL072. Let's look at just one…
user149105
4
votes
1 answer

Is it possible to use CRT tubes for audio amplification?

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 get reasonably decent results?
Daniel Oren-Ibarra
  • 77
  • 5
4
votes
2 answers

DIY guitar effect - delay

I'm trying to build a guitar delay effect based on this schematic: (https://i2.wp.com/cdn.makezine.com/uploads/2009/09/echobenderrev02.jpg) I designed and oredered a pcb :…
Brunon
4
votes
1 answer

Need help reading a schematic, is this a 220k log b pot?

This is saying a 220k log b potentiometer for the tone pot VR8, correct? That is such an extremely odd value, but I don't see that sort of notation very often either and I wanted to make sure I'm not misinterpreting. Thanks!
Jonathan S. Fisher
  • 321
  • 6
  • 15
4
votes
3 answers

where to add gain and volume controls to LM386 guitar amp circuit?

Im trying to make a super simple guitar amp. heres the circuit using an LM386 operational amplifier: What exactly would affect gain but not volume, and volume but not gain? In the example circuit on the LM386 datasheet theres a 10k potentiometer at…
TwoheadedFetus
  • 223
  • 3
  • 8
4
votes
2 answers

Guitar picks up computer interference

Years ago I bought a computer case because my other one was getting too small for the components. After moving all of the parts and booting up, one of the first things I noticed was that my guitar would very noticeably pick up interference (typical…
Alex
  • 41
  • 1
  • 2
3
votes
4 answers

Guitar amp is making bad noise when I plug in a jack only

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 without cable, it makes less noise. I tried…
Basheer
  • 159
  • 5
3
votes
1 answer

How to calculate impedance for reverb tank in a guitar amp

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: To troubleshoot this I first replaced the 12AX7 tube…
andowt
  • 988
  • 1
  • 7
  • 25
3
votes
3 answers

Guitar preamp problems

I built the following preamp to use with guitars Basically the idea is to keep it on a single rail so that I can use it off the same battery with this power amp https://www.eleccircuit.com/bridge-amplifier-bcl-18w-by-tda2009/ The Power amp is…
sean read
  • 133
  • 5
3
votes
1 answer

Using Audio Jack Switches as Paralell/Series toggle? (guitar amp and cabinets)

I have a guitar amp that has one output that can handle either an 8 or 16 Ohm load. I have a cabinet with two 8 ohm speakers (each with a separate input). I could wire the speakers in series, and get 16 Ohms. The way I want to do this is by adding…
Vidar
  • 31
  • 3
3
votes
2 answers

How can I attach an analog to digital converter to a guitar

I want to modify an electric guitar to add an ADC and microcontroller to drive some LEDs for fancy effects that follow music. Since typical output levels of pickups are about 100mV, I was thinking of adding an op-amp circuit in parallel to the…
Atilla Filiz
  • 266
  • 2
  • 9
3
votes
5 answers

When should an audio pre-amp use a differential input

As a guitarist, very familiar with the various types of noise that can wreak havoc with electric guitars, I've been mystified at how infrequently guitar amplifier inputs have employed differential stages. Of course low impedance microphone inputs…
Randy
  • 3,205
  • 3
  • 21
  • 38
1
2 3 4 5