Category Archives: products

CurvyMama + SimSym

CurvyMama is initially a preamp designed to process the flesh and grit of harmonicas sound. In this aim, It features a special tone circuit and a germanium overdrive stage.

This version + SimSym also features a boost stage.
Above all, it has an active speaker simulator, and a balanced output to the PA console.

CurvyMama SimSym Output, logo

CurvyMama SimSym Output, préampli spécial harmo avec simulateur de HP et sortie symétrique pour liaison directe avec la sono

The first CurvyMama SimSym, a custom order – March 2020.

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Samples : LikeYourFace Fuzz

LikeYourFace - logo produit L15x300dpi

Classic smooth option

Big basic Fuzz and heavy riffs, in the manner of the sixties..
Strato-like guitar.
LikeYourFace with Fat preset ; Fuzz @ 15:00 (more is possible ; Tone @ 12:00 (neutral).
Wild thing (neck pickup) : then Shape of things (bridge pickup).

Fuzz used as a light overdrive : Bright Strato blues
Strato-like guitar.
Neck pickup and Bridge pickup mixed.
Fat Preset ; Fuzz @ 10:00 to get a smooth texture ; Tone @ 13h to get more harmonics.

Classic bright option

A scratching sound, with open strings and a bit boosted medium
Archtop Guild X160,bridge pickup at first, the  mixed pickups at the end.
LikeYourFace basic, Classic bright option. Fuzz @ 15:00. No preset nor tone.
In-A-Dadda etc. (micro manche)

Bandeau medium rouge - L15

Recording conditions

Bandeau - Enregistrement - Samples-BirdMaster

2xEL84 amplifier from 1967, restored by me. Clean canal, tone control almost flat.
10″ speaker, Weber F10-150T (recommended for Fender Princeton) ; bass reflex cab.
Shure SM57, placed like in the pic above.
A bit of Holly Grail® reverberation, just for pleasure.

Strato-like guitar from the 80s, rather cheap but equiped with Rio Grande texan pickups.
Archtop Guild X160 from 1988.

Bandeau fin gris moyen - Samples


MicroCombo 3W is a portable and powerful micro-amp for guitar or harmonica.
The all Germanium power amp, the big brand speaker  give to it efficiency and musicality.
It will let you play at home or in small places, connected to an external cabinet or to the sound system of the bar.
Options are available when ordering.

MicroCombo 3W, ampli 3W pour guitare et harmonica - amplification au germanium

MicroCombo3W in its walnut enclosure.

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CoolCrunch is made to attenuate the volume on the speakers without lowering the master volume of the amp …
One keep then the crunch without breaking the ears …
Due to its small size and simplicity, it fits inside the combos and in your budget.

CoolCrunch 5 & 30. Logo

CoolCrunch5. Speaker attenuator in a Fender Champ 57 reissue

A CoolCrunch5 prototype installed on the back of a Champ 57 reissue.

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LowVoltTube is an original pedal that combines two fundamentals of the guitar sound :
— A preamp-overdrive, TS9 type, with its tone control …
— A tube stage included to generate a vintage grain.

The tube is a 50s NOS model, specially designed to work directly with 9V or 12V.
Boutique quality, but for a moderate price !

LowVoltTube preamp/overdrive - Logo

LowVoltTube. Préamp/overdrive with JRC4558 and NOS tube 6ET6 (EF98)

LowVoltTube — First issue, 2018.

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Mama’s tone controls

General principle

CurvyMama’s tone controls are original circuits, working in the frequency ranges that cause the roundness and clarity of the sound : Low mids between 150 and 250Hz, and the medium / trebles articulation between 1 and 3 kHz …
Traditional circuits seldom operate on these specific frequencies, but rather on bands that are easy to spot but not so substantial on  the musical wise.

So, setting the tone of CurvyMama may seem less obvious than keeping bound to the broad categories Low / Medium / Treble. This is much like adjusting sound colors, more subtle nuances. It can be very intuitive. Musicians have ears, right?

Bandeau medium rouge - L15 - Tonalité

CurvyMama, a preamp/overdrive for harp. Special Tone controls.

The controls of CurvyMama, Harp version.

The tone controls


• Sets the level of upper bass and low mids. (100 to 250Hz). This setting gives the thigh to the harps and somme curves to the guitars, without bringing unnecessary bass.
• Almost neutral effect in 12 o’clock position.


• Balances the overall balance of the mid-high range (500-2000Hz).
• Almost neutral effect in 12 o’clock position.
Turned left : filters to a darker, softer tone.
Turned right : filters to a clearer and more biting tone …
• Very interactive with the Contour setting.


• Contour sculpts the medium / high frequencies that Biting has globally set.
• It treats together and symmetrically the medium to 600Hz and treble to 3000Hz.
Turned left : attenuate the treble AND draws a slight medium hump.
Turned right : hollows the medium AND boosts the treble.
• Almost neutral effect in 12 o’clock position.

Specific switches of the Harp version

The Less Mids switch straightens the bandwidth in case of excessive mid frequencies.
It notches the tone to 1.5kHz. It’s good for the ear, especially in the case of crystal bullet mikes that sound often harsh. Just as useful, it reduces the risk of feedback.

The Invert Phase switch don’t change the tone, but reverses the phase of the output signal.
This can be very useful to minimize feedback. For a given position of the musician on stage, there is always one of the two positions that alleviates the problem.

Bandeau medium rouge - L15 - Tonalité

Useful benchmarks

The Bottom, Biting and Contour settings are neutral when they are set at 12 o’clock.
It is convenient to quickly recover a sound reference and then work its color.

• Knobs all turned in the same way give a sound of low interest, and sometimes just an increased volume.
One get richer sounds with controls set on different positions.

What setting order ?

It is better to start with the most general settings, then go to the most special settings, and finally set the nuances …

1. Bottom. Starting with bass and low medium, one gets immediately the roots of the sound, where the fundamentals are … The general level and the grain will depend on this first setting

2. Biting. One can then set the sweet / biting balance. This is important because guitar and harp are instruments that can be easily aggressive to the ear.

3. Contour. Finally we specify the mid / high zone:
denser and hot on the left, more hollowed out and pointed on the right …
This leads to differentiate and carve into the sound.

4. Play with the Biting / Contour interaction :
Biting and Contour each operate in their own way in the same medium-high range.
• General principle: Biting ensures a global balance while Contour carves détails…
• They are cumulative if they are turned in the same direction :
dark on the left, sharp on the right.
• They draw nuanced sound profiles when they are operated in opposite directions :
for example, one is turned to 10:00 am when the other is turned to 14:00, and vice versa …

5. Think of adjusting the texture by setting the Drive (Gain) :
Drive allows you to dose the grain of the sound, from a smooth texture to the appearance of a grain, then to the overdrive on loud passages or in the entire musical game.
• The overdrive is very related to the tone controls settings because they work upstream of the saturating stage, like on vintage amps.
• In particular, Drive and Bottom are almost always jointly settled.

Good finds!

Guitar Poppa

The (S)cream

The (S)cream is an advanced diode overdrive that develops the sonic potential of the classic small green box :
Its sound comes from the TS9, but not exclusively centered on midrange: The (S)cream can as well recover the sound of 1975-85, recall the nervous grain of the first Black Face amps, or generate a contemporary overdrive …

The (S)cream

Overdrive The [S]cream by

The (S)cream —  Basic version and  *** version.

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