Furutech/ADL GT40 Alpha preamplifier

Phono Preamplifier

USB Asynchronous

DAC A/N 24 B/192 kHz

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Manufacturer : ADL

489,00 €

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Shipped within 3 to 5 working days Available within 1 or 2 weeks

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The ADL (Alpha Design Labs) GT40 Alpha phono preamplifier is designed for audiophiles who like to store their music on their computer's hard drive. It is a reasonably-priced high-performance 24 bit/192 kHz converter that converts LPs or other analogue sources to digital. It guarantees optimum sonic quality for each archived album.

ADL by Furutech GT40 Alpha : Chassis

ADL/Furutech's GT40 Alpha comes in a non-magnetic audiophile grade housing.

The back panel features rocker switches to ward off any distortion during recording (0 dB, 6 dB or 12 dB).

ADL GT40 Alpha Back of the product

ADL by Furutech GT40 Alpha : Functions

It offers the same basic features as its ancestor, the famous GT40. Also, it manages a 24 bit/192 kHz USB asynchronous input and output.

It features a 24/192 compatible DAC and ADC contrary to the GT40 that is limited to 24/96 kHz. The frequency response is significantly wider, more than 20 Hz in the bass and 5 kHz.

Noteworthy fact: le 'line' output level is higher than on the GT40, which allows for active speakers or a power unit to be driven more easily.

The headphone section has been improved with an increased current capacitance that allows for a better control of low impedance headphones.

ADL GT40 Alpha Chassis

For the rest, the same principles apply, chassis, connectors, etc.

This ADL GT 40 Alpha comprises an asynchronous low latency USB output that plays and records in 24bit/192 kHz format.

It includes a low noise MM/MC phono stage.

Its DAC comprises L/R analogue outputs and a switchable line or phono input.

ADL by Furutech GT40 Alpha : Listening and test review

The sonics with the headphones are great and are on a par with the top products on the market. We tried it with three different sets of headphones (ranging from €150 to 2,000) and every time this ADL GT40 Alpha phono preamp passed with flying colours!

The music is smooth and very precise, irrespective of the source, but it is an obvious step-up thanks to the high resolution Master files.

The digital conversion of records is amazing and, above all, this GT40 is compatible with high output sources featuring MC cartridges, that few USB phono preamplifiers have, and especially with this level of quality!

The sound quality is vibrant and highly musical.

ADL by Furutech GT40 Alpha : Unboxing

Setup and operation are child's play.

In a word, this ADL GT 40 Alpha can do everything, and remarkably well at that! A unique and unrivalled product whose performance is on par with professional products.

We heartily recommend it!


Audacity link (free digitisation software) click on the link:

- For MAC

- For PC

- For Linux



Hi-Fi Choice Recommended - 2015
Audio Magazine - Empfehlung - 2015
Audio Magazine - Klangurteil - 2015
HiFi Digital - Exzellent - 2015
VGP - 2015


Digital input: Asynchronous USB
Digital output: Asynchronous USB
Driver: Windows Win XP(ASIO), Win 7 and Win 8 (not Vista)
Analogue input: Commutable line/Phono: 1 x gold-plated RCA stereo
Analogue output: 1 x gold-plated RCA stereo
USB resolution: 24 bits/192 kHz
Recording resolution: 24 bits/192 kHz compatible 32, 44.1, 48, 88.2, 96, 186.4 and 192 kHz

Frequency response: 20 Hz ~ 20 kHz (+/-0.5 dB)
Signal-to-noise-ratio: >90 dB (line output)
Line output level: 5 V rms
Input sensitivity:

MM phono: 4.0 mV/47 kOhms

MC phono: 0.4 mV/10 kOhms

Line: 400 mV/ 47 kOhms

MM Gain: 48.5 dB
MC gain: 62.5 dB
headphone output: 94 mW (16 ohm), 110 mW (32 ohm), 98.6 mW (56 ohm), 23 mW (300 ohm) Max.

Recommended headphone impedance: 16 to 300 Ohms

Power supply: 15 V/0.8 A
Dimension: 150 x 57 x 111 mm

Weight: 650g

Banc d'essai HiFi Digital

4.28 Mo - pdf

Banc d'essai Hi-Fi World

2.57 Mo - pdf

Banc d'essai Stereotimes

1.67 Mo - pdf

Banc d'essai Audio Magazine

4.32 Mo - pdf

Banc d'essai HiFi Choice

0.95 Mo - pdf

Banc d'essai - Vumètre

1.4 Mo - pdf



Hi-Fi Choice

Recommended - 2015



Audio Magazine

Empfehlung - 2015

Audio Magazine

Klangurteil - 2015

HiFi Digital

Exzellent - 2015
Customer reviews
(2 reviews)

Customer reviews


Furutech ADL GT40 alpha

Grandiose, c'est le moins que l'on puisse dire une qualité de son au top en préamplification phono et comme dac via mon serveur audio "daphile" et entierement reconnu en enregistrement avec audacity sous linux, le reve audiophile enfin à portée de main merci maplatine ;)


Préamplificateur Furutech / ADL GT40 Alpha

Produit de très belle qualité qui a magnifiquement trouvé sa place avec ma platine REGA RP3. Le timbre est très pur, dynamique, la préamplification de 48 db permet d'avoir un signal sortant suffisant pour éviter de pousser l'ampli lorsque l'on passe d'une source numérique à la source vinyle.
Quant à la sortie USB... c'est génial et bluffant. Les quelques enregistrements réalisés à ce jour sont difficiles à différencier de l'enregistrement initial, preuve que ce GT40 fait extrêmement bien son travail : Il devient une carte son de très haute facture...
Merci encore pour le bon conseil de Franck. A ce prix, ne vous privez pas...

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Furutech/ADL GT40 Alpha preamplifier

Furutech/ADL GT40 Alpha preamplifier

Phono Preamplifier

USB Asynchronous

DAC A/N 24 B/192 kHz

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