Some pictures: electronics repair. The product name: Dynacord Eminent II. This is beginning to be manufactured in the mid sixties. Initially, all tube design, and later the transistor preamp and tone section. Meanwhile, little change in design as well. This four different input and tone control. A small band certainly met at that time.Well, let’s look at what is inside.
So far, we do not really dealt with bass guitar effects, amplifiers. Here, in this time of change! One of my favorite band The Beatles, inspired a new tube bass preamp creation. The plates can hear great tunes and sounds of the XXI century it is significant. This’ 60s-edge tone you want to give a little back. This simple, little preamplifier may be able to create a good bass sound.
Okay, what do we need? First, a simple tube preamp and a tone sections. And yet… put a little extra! Whether it is a switch which can give more prominence to the bass sound. And finally result in the power amp section. The tube 12AX7 or ECC83 should be. And we are ready to go.
Build the bass guitar preamp
As shown in a schematic diagram, not complicated circuit. The circuits are designed triodes ordinary way. Located between the two triode the tone control section. Here we must mention the little extras are what we promise you. It was built in the SW1 signal switch and capacitor C7. This will give even more powerful bass sound.
Even a small change in the circuit (well, not so little, the C8 is quite large capacitor). The C8 was originally 100nF, it was replaced with 1uF. Thus, it improved bass response with what is perceptible difference. Suggested type for a high-quality MKP capacitor. We conducted a little experiment, was left inside the 100nf and 1uf capacitor, one switch to choose between the two, and thus is connected to the output. so you can compare the two capacitor deep voice transmission. Feel free to experiment with different manufacturers and types of capacitors.
Bassline – tube bass guitar preamp – click to open full size
Do you know that feeling when you’re playing on guitar however you’re missing something? You’ve got many effect like distortion, overdrive, delay or something programed effect. You’re sure something is missing from your music and it’s not other than fatty and lively sounding.
Fortunately there is a solution for this. It’s a very interesting device. It’s Aural Exciter or “harmonic enrichment”. This circuit adds harmonics sounds for the incoming signal. Aphex Electronics company made the first device in the 70’s. Initially it was made with vacuum tubes later with transistor. Nowadays you can get it as a software.
How does Aural Exciter work?
The incoming frequency multiplied by circuit. Well, if the incoming frequency signal is 2 kHZ than the circuit generate it to 4, 6, 8, 10, 12, 14, 16 kHZ frequency.
Once again an interesting circuit. Okay,to combine it witha tubepreampandafuzz face! What happens if a small powerful tube amplifier, and combined with the classic fuzz effect? What kind of sound will be the result?
Well, again, we present a very simple circuit. As is also shown in the drawing, few parts. The circuit is based on a dual operational amplifier RC4558. But this is only half used, so there is only one using the op amp. Alternatively, you create an active tone control in the second operational amplifier section.
The legendary Rangemaster effect. At the time, that is the end of the ’60s, the amplifiers are not prepared to distortion. I prefer to have a nice voice, faithfully reproduce the sound of the guitar.
Of course, it was possible to overdrive when the guitar was full volume. If an external device, the sound midrange has been highlighted, they were given a musically useful sounds. At that same time, more “mid boost” existed. Among the most famous of all, to this day the “Dallas Rangemaster”. This is a very simple circuit using germanium transistor. The original device uses a OC44 transistor.
You know the fuzz sound, but something is missing from it? Well, if something new or slightly different experience, these circuits can produce an alternative sound. This Hybrid Germanium Fuzz. Why Hybrid? It is combined with the old and new types of transistors. As the old germanium (AC128) in the current one (2N3904) are made of silicon. So meet old and new technologies. The whole circuit is based on the old familiar fuzz circuit. These do not have to change much. But what if before the fuzz, coupled with a preamplifier? For example:
So, a pretty extreme sounds, or get extra distortion. Practically four parts and stronger, rougher sound is obtained. This small preamp, an existing Fuzz pedal built into it, such as tuning or mod. The options are:
Noise: Eliminate the high frequencies, less wheezing sound.
You need a new and simple Distortion effect? Really Simple? Look at this circuit:
The simple distortion efect circuit.
Not too demanding parts. But the voice .. hmm. Indeed, only a few spare parts required. The circuit is the “soul” of the tl072 chip. It is built around the circuit. And, of course, add garnish. Well, actually distort the character of the D1 – D4 diodes is given. In this case, two 1N4148 and two 1n914 diode. cut the signal. This results in a symmetrical but powerful cut. or maybe the solution according to their own ideas, but you can choose a sound character. even the parts is not too critical. I recommend them to feel free to experiment. Perhaps trying a different opamp is that it leads to what sound will surely hear some variation. the completed circuit can also change your tone of options. Examples: tone controls
LM386 overdrive: easy,cheap, andfastto make. Thisis knownand popularaudioamplifiercircuitwith a fairlysimplebutgoodsoundingoverdriveguitareffect.Neithertheoperation of thecomplex.
LM386 Based overdrive guitar effect
BS170mosfetguitarsignal tothealreadyworsened.the R8potentiometerregulatesthe amount ofsignaltothe386.If you havemore than thatthechipcan handle,thenthe signalwill bedistorted.That is,the“overdrive“.So it isquitedry androughsound.Andof course it’sgoodfor us.Listen to:
We like to test the effects of different circuits, in addition to its own development. So we found a simple, few parts built in guitar Overdrive circuit. The first stage is a 2N7000 or BS170 MOSFET, J201 JFET the second circuit. The J201 Drain voltage is 4.5V. The R9 potentiometer to adjust. Variations may be a little higher voltage softer, low voltage rought the voice.
Peppermill guitar overdrive
Some portions of the circuit is different from the original. Example C1, C2, C3 capacitor value. But that does not noticeably affect the sound.
For more information, please visit the original site:
The simple Muff Booster. This is a very simple circuit distorting project. Surely many people familiar with the legendary Electro Harminix from Big Muff guitar pedal. Many famous guitarists among almost as standard tools. this circuit, only a part of the original. One distortion segment. The electronic parts type of not sensitive, feel free to experiment with different types transistors and diodes, so a little bit different sound can be produced.
The diodes and transistor should be placed in a socket to be easily and quickly replaced. We tried out the following components: 2N2222, 2N5088, 2N3904, 2N2222, BC108 transistors and 1N914, 1N4148, red LED, 1N34 germanium diodes. The diodes to number want change , symmetrical, asymmetrical way to connect.
The high voltage tube guitar preamplifier project is an adaptation of the famous tube preamplifier to suit the DIY’ers demands. Searching the net, I’ve never come across similar idea, so I decided to share this version of our very popular design. This a classic, conservative design, that easily matches other musical devices. The preamp contains one channels of real-tube, high-gain circuit. This circuit uses JJ ECC83 (12AX7) tubes. Circuit uses a stabilized 12V DC voltage.
While playing the guitar many times there is a problem that unwanted noise can appear. Hence the need for a guitar noise gate. It happened specifically to a high-gain circuit is very sensitive to the surrounding radio signal.