Advance Paris WTX-TUBES

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.

Physical design and ergonomics

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.

Technology and audiophile components

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 Raytheon 5703 tubes: the analog soul

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.

Connectivity and system integration

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.

Sound performance and musical signature

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.

Applications and use cases

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.

Technical Specifications

Architecture and Processing

• Technical solution: QCC, Wolfson, Raytheon
• Triple-core processor:
  • Dual 32-bit cores
  • Single 120 MHz core

Wireless Connectivity

• Bluetooth technology: Bluetooth 5.0
• Supported codecs: aptX, aptX HD, AAC, SBC

Digital-to-Analog Conversion

• Wolfson WM8740 DAC:
  • Resolution: 24-bit / 192 kHz
  • Dynamic range: 117 dB
  • Low clock jitter

Analog Section

• Tubes: 2 × Raytheon 5703
• Mounting: subminiature tubes mounted on a fixed insulating support
• Audio outputs: analog via tubes

Physical Characteristics

• Device dimensions (W × D × H): 130 × 110 × 42 mm
• Box dimensions: 255 × 180 × 60 mm
• Net weight: 532 g
• Gross weight: 870 g

Highlights

• Warm, analog sound reproduction, akin to vinyl
• Supports 24-bit / 192 kHz high-resolution files
• Combination of high-end technologies: QCC / Wolfson / Raytheon
• Compact, elegant design