Triode TRX-EQ7 Phono Stage

The Triode TRX-EQ7 employs a Class A FET solid-state circuit optimized for low noise and high linearity, supporting both MM and MC cartridges via adjustable impedance loading (MM: 47kΩ; MC: 4-47Ω). 

 

Circuit and Performance Design

Its RIAA equalization achieves ±0.5dB accuracy from 20Hz-20kHz with 0.025% THD and 70dB channel separation, using discrete FET inputs for MC sensitivity down to 0.25mV (64dB gain) without hum.  Single RCA input/output keeps the signal path minimalist at 300Ω output impedance, powered by an external AC/DC adapter for vibration isolation.

General

• Circuit type: Solid‑state amplifier (MC circuit uses Class‑A FET amplification)  
• RIAA deviation: ±0.5 dB (20 Hz–20 kHz)  
• Total harmonic distortion (THD): 0.025 %  
• Channel separation: 70 dB  
•  Input terminals: 1 × RCA (single phono input)  
•  Input sensitivity: MM 2.5 mV / MC 0.25 mV  
• Gain: MM 46 dB / MC 64 dB  
• Input load impedance: MM 47 kΩ / MC 2 Ω–47 Ω (adjustable range)  
• Output terminals: 1 × RCA (unbalanced)  
• Output impedance: 300 Ω  
• Power supply: Dedicated power adapter (DC 36 V / 1 A)  
•  Dimensions: 90 mm (W) × 230 mm (D) × 100 mm (H)  
•  Weight: ~1.0 kg  
•  Included accessories: Dedicated power adapter  

 

 

This combination of high gain (64 dB for MC) and low distortion with realistic RIAA accuracy makes the TRX‑EQ7 suitable for connecting both MM and low‑output MC cartridges to systems that lack built‑in phono stages.

Performance Impressions

Italian reviewer Consound calls it an “excellent quality/price ratio” device with a “warm and refined” timbre that’s “airy” and handles low-output MC cartridges (down to 0.2mV) without noise, outperforming competitors in quietness and musicality.  Expert-HiFi notes its “exceptional performance and great flexibility” for audiophiles seeking detailed vinyl playback. 

 

Sound Quality Impressions (Audiophile Feedback)

• Clean, quiet background with very low noise floor, even in MC mode
• Natural, analog-focused presentation without artificial warmth or coloration
• Good dynamics and rhythmic drive, making music feel lively and engaging
• Clear midrange and well-defined treble, suitable for vocals and acoustic music
• Honest, straightforward sound character — prioritizes musical flow over exaggerated detail
• Not overly analytical, but highly enjoyable for long listening sessions
• Best suited for listeners who prefer musicality and balance rather than ultra-clinical precision

This is a very fine ex-showroom model in mint condition. It has been well tested over a 2 weeks period with 2 different turntables installed with 2 different low output MC cartridges.

 

Condition Overview:

• Cosmetic Condition: 9.5/10 – Mint Condition.
• Performance: 9.5/10 – The sound is ‘warm and refine’ and the body is ‘airy’, a very musically engaging phono stage, excellent choice for vocals, pop, rock and jazz.

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For any vintage audio hifi equipment:

Please be aware that, given this vintage hifi equipment's age, certain switches and original parts are no longer in production. While we’ve thoroughly cleaned and lubricated all switches, any “gari gari” scratchy noise (as they’re called in Japan), is simply NOT possible to eliminate this characteristic entirely.

We recommend regular servicing every 2 to 3 years, depending on the equipment, to keep this vintage hifi in peak condition. This advice applies to all vintage equipment—be cautious of sellers who claim "brand-new condition" or “better than original.” Minor scratchy sounds in control knobs are typical for vintage gear and should not be seen as a defect but rather a natural sign of its history.