H&G Amplifiers - H&G Amplification is an manufactory that designs and manufactures music amplifiers, speaker cabinets and boutique guitar effect pedals. H&G Amplifiers - H&G Amplification is an manufactory that designs and manufactures music amplifiers, speaker cabinets and boutique guitar effect pedals.

H&G Amplifiers

H&G Amplification is an manufactory that designs and manufactures music amplifiers, speaker cabinets and boutique guitar effect pedals.

by H&G Amplifiers

Bassline – Bass Guitar Tube Preamplifier


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.

The idea

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 - bass guitar tube preamplifier

Bassline – tube bass guitar preamp – click to open full size

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Aural Exciter Makes Your Sounding Real


Aural Exciter since the 70’s.

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.

Here you can find the circuit of Aural Exciter or Harmonic Enrichment. Furthermore you can read interestin' things about this fantastic effect.

Exciter circuit

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Transfuzzion: Silicon Fuzz Face and the ECC83/12AX7 tube preamp.


Once again an interesting circuit. Okay, to combine it with a tube preamp and a fuzz faceWhat happens if a small powerful tube amplifier, and combined with the classic fuzz effect? What kind of sound will be the result?

Transfuzzion, one 12AX7 tube and silicon fuzz face.

Transfuzzion schematic

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Red Lights – RC4558 op amp based distrortion.

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.

Red Lights: rough and scratchy-voiced Rc4588 op amp-based guitar distortion. Tested!

Red Lights Guitar Distortion

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The Rangemaster treble booster

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.

The Rangemaster treble booster. If you're looking for guitar boosters, definitely try it.

Treble booster schematic


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Hybrid Germanium Fuzz

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:

Hybrid Germanium fuzz basic circuit. Use NOS germanium transistors.

Basic circuit

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.
Volume: Output level
Fuzz: The amount of distortion
Compression: Stronger or softer fuzz effect

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Simple distortion effect with TL072

You need a new and simple Distortion effect? Really Simple? Look at this circuit:

Simple distortion effect circuit, few parts, real guitar distortion sound.

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

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LM386 Overdrive Effect

LM386 overdrive: easy, cheap, and fast to make. This is known and popular audio amplifier circuit with a fairly simple but good sounding overdrive guitar effect. Neither the operation of the complex.

LM386 Overdrive Guitar Effect

LM386 Based overdrive guitar effect

BS170 mosfet guitar signal to the already worsened. the R8 potentiometer regulates the amount of signal to the 386. If you have more than that the chip can handle, then the signal will be distorted. That is, the overdrive. So it is quite dry and rough sound. And of course it’s good for us. Listen to:


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Peppermill guitar overdrive


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 schematic. Remind one driven guitar amp. With J201 JFET and 2N7000 MOSFET.

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:


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Muff Booster test

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 EHX Big Muff segment circuit. Muff Booster guitar distortion.

The Muff Booster circuit

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High voltage tube guitar preamplifier with 12AX7


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.

High voltage tube guitar preamplifier

High voltage guitar preamplifier circuit


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