All Questions
Tagged with preamp guitar-pedal
7 questions
2
votes
0
answers
994
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Active low pass filter built around an LM386
I have some theoretical electronics knowledge from uni, but when it comes to applying it in practice, things can get a little bit complicated.
I've built simple stomp box, basically a piezo transducer ...
- 21
0
votes
1
answer
3k
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12AX7 Valve Overdrive/Distortion Effect Pedal
I'm following the schematic below using the recommendations plus a couple of extra LEDs. With the footswitch in the enabled position, I'm not getting any sound. In the bypass position, the input and ...
- 183
0
votes
1
answer
489
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How to measure the output impedance of a valve preamp?
I was trying to measure the output impedance of a DIY preamp for the past couple of days without any luck. Each time, I got to the same result of around 3K3 ohm, which is unbelievably low.
This is ...
- 1
1
vote
1
answer
452
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How To Eliminate Amplifier Squeal When PreAmp Power is Turned Off
I have a bass guitar that has a built-in pre amp, which is switched ON whenever the cable is plugged into the bass. I typically use the bass all day, and leave the amp on and the bass plugged in - ...
- 11
0
votes
3
answers
4k
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Running preamp tube filament on 5v?
Is it safe and not harmful to run a preamp tube filaments at 5v? The tube is ECC85. I built a tube preamp in a DIY portable guitar amp. It's very similar to Matsumins valvecaster with a few slight ...
- 365
0
votes
1
answer
54
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How to 'simulate' an input device?
I made a diy guitar amplifier with two seperate amplifiers. When potentiometer is raised something strange and annoying begins - various whispers, noises and reacts really strange. HOWEVER this never ...
- 365
2
votes
3
answers
4k
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Is there any real world difference in upgrading TL071 to OPA314?
I have a DIY made guitar amp in which there is a TL071 preamp section. I read various opinions about how upgrading op amp improves that sound and how it doesn't do anything really... I'm quite ...
- 365