AUDIOPHONICS PRE-A Class A Preamplifier Volume Control & Source Selector

Audiophonics Class A Preamplifier Volume Control & Source Selector

This is an accurate, compact preamplifier with source selection (three inputs) and analog volume control. It works in class A for clear and transparent sound reproduction.

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4.5 / 5

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Accessories for this product

Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.

 
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Preamplifier volume controller source Selector

Preamplifier Class A / Potentiometer ALPS / LM337 / 7812CT / CMC816

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Here a precise and compact preamplifier equipped with a source selection function (three inputs) and an analog volume control. It operates in class A for clear and transparent sound reproduction with minimal signal coloring. A linear regulated power supply with R-core transformer make a reliable device, responsive to the specifications to fit both in an advanced system that in a small and compact system.

Discrete output stage

Typical circuit HDMA Hyper Dynamic Amplifier Module


Amplification of the signal is designed in discrete component With its gain stage directly integrated to the PCB.

Thanks to a design based on a standard architecture HDAM this circuit enjoy superior insulation and very low latency in the voltage rise. It thus provides excellent dynamic reproduction while maintaining noise below a very low threshold.

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Source selector

A rotary knob 4 position immediately toggles between three different sources. This preamplifier is able to combine several sources (PC-DAC, phono preamplifier, integrated network drive ...) and switch from one to the other without changing connections.
The fourth and final position of the rotary knob (full clockwise) allows to transfer the input signal without disrupting the volume or turn off the device.

To avoid any confusion or accident in the connection of different input devices, marking each position is found at the back of the housing at the corresponding RCA inputs.

All RCA connectors are gold plated 24k CMC816 model for a very respectful maximum conductivity of the audio signal.

Volume Control

This preamplifier has an analog volume control based on a potentiometer ALPS.

The volume can thus be easily controlled via a knob on the front.

This stereo fader follows a logarithmic dimming curve that will work well with equipment sensitive to slight variations as with demanding installations requiring high volumes.

Amplificateur_class_a_audiophonics_8p.jp
Rcore transformer linear power supply preamp class A

R-core transformer


This preamplifier operates a Class A power supply for rendering a transparent sound which remains rich in detail. This power supply is centered around an R-core transformer, a linear voltage regulator 7812CT as well as Nover capacitors.

This type of configuration positively affects the sound quality of an audio installation as a whole while emphasizing the technical qualities of the audio / DAC before it.

Each controller is respectively mounted on a radiator and is accompanied ELNA capacitors and WIMA film capacitors in order to maintain the balance and overall stability in the process of preamplification.

The diode bridge uses resistors 718 Beijing having excellent heat resistance and superior accuracy.

Linear power supply
Specifications
TypePreamplifier
Source selector
Volume Control
Inputs3x RCA Stereo
Output1x RCA Stereo
Output impedance100Ω
Output level9V (@ 2V input)
RCA ConnectorsCMC816 24K gold plated
Power SupplyClass A
Discrete gain stageYes
Gainx6
Input sensitivity1.5V
Max Output9V
Source Selection3 positions + mute
CasingAluminum
Dimensions260 x 192 x 68 mm (without connectors and potmeters)
290 x 192 x 68 mm (with connectors and potmeters)
Weight2540g
Package Content
Preamplifierx1
Power-cord 0.75mm²x1
 
Data sheet
InputRCA
OutputRCA
ColorBlack
ClassClass A / AB
Remote ControlNo
 
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Average votes
4.5 / 5
18 reviews
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Note :
 5/5
Date :
Wonderful device.
Very well built enclosure with a nice, smooth finish, with a tactile and linear volume pot. I did also experience some hum through my speakers but that was fixed by removing the earth connection in the power cable. There is no need to open up the preamp to disconnect the earth. Now it is silent.
It requires a few days of break-in, thereafter the sound becomes much more refined and spacious. It is a really enjoyable listen, smooth and non-fatiguing with excellent detail retrieval and well controlled transients. Tonal timbre is also excellent.
Digging a little deeper, this board appears to be based on an Accuphase C3850 design, although I can't be 100% certain. Nothing to complain about here, it sounds fantastic.
It has a lot of gain - so much so that I reduced my pc output gain by -8db otherwise you don't get to use more than 1/4 of the volume pot sweep range.
My front end consists of toslink from pc feeding into a Audiophonics DigiRescue reclocker toslink to coax converter, a SMSL SU-1 dac fed via coax and rca out to this preamplifier going into active studio monitors with rca cables. This combination is the finest sounding front end I've ever owned. The law of diminishing returns applies here and I feel I would need to spend multiples more to improve my front end.
The preamp on its own is already a great improvement to sound quality, but if you can rig it up like I did you will be in for a surprise. This is my best hifi find for 2023 and I can highly recommend it. Thanks!
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This review has been posted for AUDIOPHONICS PRE-A Class A Preamplifier Volume Control & Source Selector
Note :
 5/5
Date :
Très bon
Se complète parfaitement avec l’ampli MPA-S125NC, justesse des timbres et transparence… ce que l’on demande à un bon préamplificateur.
 (1)
 (0)
This review has been posted for AUDIOPHONICS PRE-A Class A Preamplifier Volume Control & Source Selector
Note :
 2/5
Date :
Euh ! comment vous dire...
Comme d'habitude, livraison rapide.


Produit qui à un aspect assez qualitatif, mais avec pas mal de soucis...


1/ Buzz dans les enceintes.
2/ Fuite du son sur la position "Mute".
3/ Sérigraphie du sélecteur de source qui ne correspond pas aux entrées RCA...


J'ai bien vu dans les commentaires, qu'il était possible de remédier au souci de Buzz en modifiant le potentiomètre de volume, mais pas vraiment habile pour ce genre de chose. De plus, je ne savais pas que j'étais un acheteur/testeur/réparateur...
 (3)
 (0)
This review has been posted for AUDIOPHONICS PRE-A Class A Preamplifier Volume Control & Source Selector
Note :
 4/5
Date :
Bon rapport Q/P
Un souffle audible dans la voie aigue, mais qui ne s'entend plus lorsque le CD joue. Buzz gênant qui peut se résoudre très facilement en déposant le potentomètre , et en supprimant le petit fil soudé sur le haut du potar = plus de boucle de masse, plus de buzz. Le son est agréable, sans agressivité sur mes compressions pavillonnées. (BMS 4590);
Pour un prix raisonnable, on a une écoute sympathique et sans agressivité.
 (1)
 (0)
This review has been posted for AUDIOPHONICS PRE-A Class A Preamplifier Volume Control & Source Selector
Note :
 5/5
Date :
Excellent préampli
Audiophile depuis plus de quinze ans, et client depuis de nombreuses années, n'ayant jamais été déçus par le professionnalisme des gens de chez Audiophonics, une fois encore cela c'est avéré exact.
Contexte: après avoir envoyé un mail à M. Aubert lui expliquant que suite à la mise en réparation de mon ampli intégré habituel (Cambridge Audio), j'ai mis en service un petit (mais puissant) ampli de classe D (SURE A2100 Explorer), afin d'alimenter mon système à base d'enceintes larges bandes (Fostex), d'un caisson JBL, d'une platine Marantz et d'un lecteur numérique FIIO, le tout orchestré par un Mini DSP 2X4 HD. L'écoute du classe D par rapport à mon ancien ampli s'avérait très neutre et plaisante avec une belle qualité des timbres, mais à mon gout manquait d'un poil de dynamisme.
L'achat d'un préampli pour vitaminer tout ça, me paraissait indispensable (c'est souvent ce qui ressort avec les amplis classe D, ou l'ajout d'un préampli apporte une réelle plus-value à l'écoute).
C'est donc en ayant suivi ses conseils que j'ai acheté ce préampli j'ai donc reçu l'appareil de "format moyen" (ni tout à fait compact, ni au format habituel des appareil hifi). Ce dernier s'avère excellent dès les première notes (Classe A oblige), transparent, très dynamique, facile à utiliser. ça a radicalement changé mon système. De très bon, il est passé à excellent. La qualité de fabrication n'est pas en reste: boitier, boutons… et mention + à la connectique très qualitative. Seule la LED rouge en façade est un peu dérangeante, elle éclaire trop… (c'est malheureusement souvent le cas avec les appareils d'aujourd'hui).
Pour le prix, vous pouvez y aller les yeux fermer, vous ne le regretterez pas, je pense même qu'il rivalise sans soucis avec des appareils beaucoup plus chers.
Merci et bravo à toute l'équipe d'Audiophonics.
 (1)
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This review has been posted for AUDIOPHONICS PRE-A Class A Preamplifier Volume Control & Source Selector
 
AUDIOPHONICS PRE-A Class A Preamplifier Volume Control & Source Selector
This is an accurate, compact preamplifier with source selection (three inputs) and analog volume control. It works in class A for clear and...

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