Mini valve preamp + EU power supply

Rated 4.78 out of 5 based on 9 customer ratings
(9 customer reviews)


Add clarity, definition and warmth to your sound, while preserving the original timbre and sound character of your instrument, thanks to a dual stage all valve preamplification. Now you no longer need to set up all kind of potentiometers, switches or wiring options to achieve the sound you wish.



This preamp is fully engineered, hand made and painted at an artisanal level in France by Thierry and Olivier Laval.

Here at LavalAudio, we know that every musician’s precious play time must be used to actually play music, instead of treating the headache given by complex gear setup. That’s the reason why we choosed to develop this plug and play preamp, which will give you the best sound, right after being plugged to your favorite instrument.

Output at instrument level, compatible with any other amplifier, effect pedal or sound card instrument input.

Full valve audio signal path (no transistor or integrated circuit), polypropylene capacitors and metal film resistors guarantee the user a very high sound quality, authentic, warm, natural and above all musical.
This pedal also acts like a buffer lowering the impedance your instrument pickups, which in turn allows you to use longer jack cables without any loss in terms of signal quality or high frequencies, especially when using it with passive pickups. If you already have an active guitar / bass the buffer effect is reduced since the instrument output is already low impedance, so this pedal will be less useful, even if your sound will still go through the all-tube double preamp stage, resulting in an improvement of your sound in a more subtle way.

Audio circuit is point to point wired, hand soldered with no printed circuit board.

Power supply is 9V and 12V compatible, filtering quality of your supply is irrelevant to sound quality or hum; the preamp is extremely silent thanks to an integrated power supply system.

12AU7 (or ECC82 equivalent) valve, with cover shield
Input impedance: about 1M Ohm
Output impedance: about 5k Ohm

Special Matching power supply (220V, EU) and quality patch jack included.
Power requirements: 9V – 32V direct current (DC), center negative.
9V – 0.5A
12V – 0.4A
A power supply delivering more intensity (like 1A or 2A) is perfectly fine and even recommended. It is advised to use a power supply of at least 12V, rated for 2A. It doesn’t need to have filtering or even to be audio-dedicated.
A blinking LED on your pedal indicates that your power supply is not powerful enough, don’t use it and seek another one.

Reverse polarity protection
True bypass

9 reviews for Mini valve preamp + EU power supply

  1. Rated 5 out of 5



  2. Rated 4 out of 5


    build quality is ok and sound is just touched up the way I like it. As already said works very good on passive gear

  3. Rated 5 out of 5


    I am very happy with the preamp, I like how it improves the sound of my strat, especially when recording in the sound card of my computer. Thanks a lot and keep up the good work. You rock !

  4. Rated 4 out of 5


    Nice little preamp, works great with my passive guitars and bass. More subtle with my actives. Very good sounding preamp.

  5. Rated 5 out of 5


    Très bonne pédale qui colore le son subtilement et surtout aucune ronflette!

  6. Rated 5 out of 5

    shori (verified owner)

    Happy customer here!: I’ve received my parcel under 4days: very good considering the pedal was painted right after my purchase but,
    “The cherry on the cake” is of course: the sound! This marvellous little box smooths out the the transients in such a beautiful fashion!: I used few other similar pedal before (ART, and ATM 999) but none of them sounded so musical and so dimensional, the sound gets richer without gimmicks. Well done Laval!

  7. Rated 5 out of 5

    blablacoincoin (verified owner)

    Premier ustensile à lampe en ce qui me concerne et je ne suis pas déçu, tant en terme de prix que de rendu sonore. Exit les basses proéminentes et les aigus criards, toutes les fréquences sont domptées et effectivement, la définition du son monte d’un cran. Très plaisant.

  8. Rated 5 out of 5

    Jan Neruda (verified owner)

    A great little thing! Since I’ve put it in my pedalboard, I basically leave it on all the time. Adds nice colour to both Fender MM and passive fretless. A rugged construction, nice design, good hand-made stuff, very simple – no unnecessary knobs or anything.
    Also great customer service and a very personal approach. Thanks! J.

  9. Rated 5 out of 5


    Superbe, c’est une pédalé qui fait ce qu’il est décrit, transforme le son en lampe, sans aucun ronfler ni bruit parasite (alimentation 12V minimum).
    C’est un son pas coloré, mais en même temps plus gros (sans augmentation du volume) avec plus d’harmoniques, aigus et graves, plus plein; ça Ça se sent avec n’importe quel technique, doigts, slap, mediator etc. mais spécialement dans le jeu en accords.
    Trop subtile peut être en direct, mais imprescindible en enregistrement. En tout cas, peut servir aussi comme buffer dans le pédalier.

    Superb, it’s a pedal that does what it’s described, transforms the original sound in valve sound, without any snoring or noise (12v. minimum power required). It’s a not colored sound, but at the same time bigger (without volume increase) with more harmonics, treble and bass, fuller; It It suits with any technique, fingers, slap, etc. but especially playing chords .
    Too subtle maybe, in live gigs, but imprescindible in recording. In any case, can also serve as a buffer in the pedalboard.

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