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The WTX-TUBES wireless transmitter from Advance Paris is a Bluetooth streaming device designed in France. It uses Class A electronic components and subminiature tubes to combine wireless transmission with a sound reproduction inspired by tube technologies.
The WTX-TUBES adopts a compact yet substantial format. Its metal chassis, 130 mm wide, 110 mm deep, and 42 mm high, conceals remarkable technological density. The weight of 532 grams attests to the build quality and internal components.
The front panel stands out with a tinted plexiglass window revealing the two Raytheon 5703 tubes, creating a captivating visual display as they glow during playback. This partial transparency turns the device into an object of contemplation, evoking the golden age of valve electronics while maintaining a contemporary aesthetic. The tubes are mounted on fixed insulating supports to suppress microphonic effects and maintain a constant temperature.
Construction emphasizes robustness with an all-metal enclosure, a rarity in the world of Bluetooth receivers where plastic usually prevails. This approach contributes not only to durability but also to thermal management and electromagnetic shielding. A removable rotating antenna optimizes signal reception according to the installation environment.
At its core, the WTX-TUBES combines technologies rarely paired in a Bluetooth receiver. The Qualcomm Bluetooth 5.0 controller (QCC solution) is the first stage in this sophisticated processing chain. This chip supports SBC and AAC for universal compatibility, but excels particularly with aptX and aptX HD codecs, enabling transmission up to 576 kbit/s at 24-bit/48 kHz.
Digital-to-analog conversion is handled by a Wolfson WM8740 DAC, a 24-bit/192 kHz converter renowned for its musicality. This British component, used in high-end CD players from Arcam or Cambridge Audio, offers a 117 dB dynamic range and exceptionally low clock jitter. Enthusiasts recognize the WM8740 for its distinctive sonic signature: deep, articulate bass, natural mids, and detailed reproduction without harshness.
Processing relies on an original Tri-core processor, combining a 32-bit dual-core with a single-core clocked at 120 MHz. This level of computing power, unusual for a Bluetooth receiver, allows sophisticated signal processing, minimizing jitter and optimizing conversion.
The defining originality of the WTX-TUBES lies in its tube output stage. The two Raytheon 5703 are subminiature UHF triode tubes, initially developed for military applications. These components offer characteristics ideal for audio: an amplification factor (µ) of 25, a power rating of 3.3 watts, and operation with a 6 V/200 mA heater.
Run in Class A, these tubes impart a special harmonic dimension to the digital signal. Unlike solid-state output stages, they introduce even-order harmonics that enrich timbre without distorting the musical message. This approach gives the sound a velvety texture, more organic spatialization, and considerably reduced listening fatigue.
Subminiature tubes offer specific advantages over traditional tubes: smaller size, moderate power consumption, extended lifespan, and minimal microphonic sensitivity. Their mounting on insulating supports eliminates parasitic vibrations while maintaining an optimal operating temperature.
The WTX-TUBES offers comprehensive connectivity for integration into any audio system. Analog RCA outputs allow direct connection to any amplifier or hi-fi system. Optical Toslink and coaxial S/PDIF digital outputs provide the option to bypass the internal conversion and use an external DAC, while still benefiting from high-definition Bluetooth reception and sophisticated digital processing.
The external power supply provides 5 V DC at 1 A, incorporating Active Noise Cancellation technology to minimize parasitic noise. Separating the power supply from the main audio circuit contributes to signal purity and avoids electromagnetic interference common to integrated power supplies.
Transmission range reaches 10 meters, sufficient for most home setups. Pairing is straightforward from the Bluetooth settings of any compatible device: smartphone, tablet, computer, or audiophile digital audio player. An indicator light confirms the established connection.
The WTX-TUBES transcends the limitations usually associated with Bluetooth transmission. The combination of the Wolfson DAC and Raytheon tubes creates remarkable synergy. Bass gains in fullness and definition, with precise articulation of bass lines without lag or muddiness. The mids benefit from a tangible presence, particularly flattering for vocals and acoustic instruments.
High frequencies retain their extension without excessive brightness, thanks to the tubes’ natural smoothness. This characteristic is especially welcome during long listening sessions, eliminating the listening fatigue often associated with digital sources.
The soundstage expands naturally, with depth and layering rarely achieved by a Bluetooth receiver. Micro-details emerge effortlessly, creating an impression of naturalness and fluidity in the reproduction.
The WTX-TUBES fits into a variety of setups. For traditional hi-fi systems lacking wireless connectivity, it provides an elegant upgrade that preserves, and even enhances, sound quality. Owners of vintage amplifiers will especially appreciate the synergy between the receiver’s tube warmth and the character of their classic gear.
In a modern system, the WTX-TUBES offers a high-quality alternative to built-in Bluetooth modules, which are often designed to economic rather than audiophile criteria. The option to use digital outputs also allows it to serve as a pure high-definition receiver, leaving conversion to a reference external DAC.
Fans of dematerialized music will find a way to reconcile the convenience of streaming from their favorite apps (Spotify, Qobuz, Tidal, Deezer) with a level of listening quality worthy of the best physical sources.
The WTX-TUBES stands out with its Class A tube output stage, audiophile Wolfson WM8740 DAC, and tri-core processor. This unique combination transforms the Bluetooth signal into a warm and detailed musical source, eliminating the coldness often attributed to wireless transmission. The metal construction and selected components ensure superior durability and stability.
The WTX-TUBES works with any Bluetooth A2DP device. SBC and AAC codecs ensure universal compatibility. For optimal quality, a source device compatible with aptX or aptX HD is recommended. Most recent Android smartphones support these codecs, while Apple devices use the AAC codec, which is also well handled by the receiver.
The WTX-StreamTubes integrates Wi-Fi/Ethernet network features with access to streaming services and internet radio via the Advance PlayStream app. The WTX-TUBES focuses exclusively on high-fidelity Bluetooth reception. Both models share the same sonic philosophy with their Raytheon 5703 tubes, but the StreamTubes uses a Burr-Brown PCM1796 DAC instead of the Wolfson WM8740.
The separate power supply with Active Noise Cancellation technology plays a crucial role in performance. It eliminates parasitic noise and electromagnetic interference that would pollute the audio signal. This design also enables better thermal management and increased stability of the tube analog circuit.
The nominal range of 10 meters applies in open space. In a domestic environment, walls and obstacles can reduce this distance. In the same room, the connection remains stable and uninterrupted. For use between rooms, range depends on the layout and building materials.
The Raytheon 5703 subminiature tubes are more robust than traditional tubes. Their mounting on fixed insulating supports protects them from shocks and vibrations. The original packaging, with its generous dimensions (255 × 180 × 60 mm for a gross weight of 870 g), ensures optimal protection during transport.
Alain
Very good product that allows me to add Bluetooth functionality to my Sonos speaker.
On top of that, it gives a warm sound, which is a plus!!
Comment from December 31, 2025 — Experience from December 20, 2025
Michel
A Bluetooth receiver whose quality is inversely proportional to its size and price. Equally at home on the move (train, hotel) paired with a FiiO Q15 as it is in a stationary setup with living‑room gear (Focal Arche or EarMen CH-AMP) for headphone listening. Used mainly as a transport via its coaxial S/PDIF output into a DAC, but also as a standalone player directly via RCA into a headphone amp: lovely tube‑like sonics, nothing like the typical smartphone/BT headphone experience. A qualitative leap that makes Bluetooth listening (almost) as capable as a wired Ethernet or wireless Wi‑Fi setup streaming from Qobuz HD or from physical media. Impressive. In blind tests, my friends struggle to believe me when I reveal they’ve just been listening over Bluetooth! And yet the headphones used (Meze Empyrean 2 and Focal Clear original) are hardly forgiving; this little device is surprising across the entire frequency range over an aptX connection, letting you enjoy BT convenience without excessively sacrificing audio quality. Ideal for anyone looking to modernize a slightly dated system and make the most of their HD playlists at a good price. Of course, it won’t replace a vinyl rig or a transport + DAC at €10,000 or more! But frankly, its price/performance/convenience ratio is a real bargain—I’m in no hurry to part with it! Strongly recommended if you want to take the plunge into Bluetooth while also getting that “tube” sound, without breaking the bank!
Comment from September 07, 2025 — Experience from November 28, 2024
Franck
Great product, you can really tell the difference with and without it. Fair price, excellent delivery.
Comment from June 16, 2025 — Experience from June 05, 2025
