Transaudio C7mini Audiophile-Grade Preamplifier Preamp (AC220V Silver) with MBL6010D Circuit

Transaudio C7mini Audiophile-Grade Preamplifier Preamp (AC220V Silver) with MBL6010D Circuit

C-Series Preamplifier Development Process:
* Since 2011, we have been researching, designing, and fine-tuning this circuit.
* Currently, using AP-assisted design, the overall distortion, dynamic range, signal-to-noise ratio, and other data exceed expectations, delivering a rich and melodious sound.

Circuit Features:
* The circuit, parameters, structure, and materials are identical to the MBL6010D preamplifier which costs over 100,000 RMB.
* The unit focuses on the core RCA amplification section of the original model.
* Essence of design: The signal path is extremely short, eliminating all circuits that could affect sound quality, including balance and source switching circuits.
* Motherboard design minimizes left-right channel interference.
* Input buffer + amplification structure with fully DC-coupled circuit.

Sound Characteristics:
* Transparent sound, high resolution, flat frequency response, excellent extension in all frequency ranges, ultra-low distortion, and ultra-low noise.

Materials & Build Quality:
* Third-generation super op-amp king: OPA828 single op-amp amplification
* TI5534 buffer input
* CNC-machined full aluminum chassis
* ALPS 27-type large potentiometer
* Original 30W square transformer (for Panasonic) used for power supply
* Small Taiwan-made signal wires, made of oxygen-free copper
* Pure copper gold-plated high-quality RCA terminals made in Taiwan
* Gold-plated IC sockets
* Original audiophile-grade resistors for KOA
* Jiantao high-quality printed circuit board

Specifications:
* Input Sensitivity: 2.5Vrms
* Input Impedance: 10KΩ
* Damping Factor: None
* Output Power: None
* Static Power Consumption: 10W
* Supply Voltage: Only AC220V
* Chassis Color: Silver or Black
* Preamplifier Weight: 2.5kg
* Overall Dimensions: 250 x 160mm x 80mm

AP-Assisted Design and Test Parameters (upgraded to OPA828 test data in March 2024):
* Output RMS Value: 11.87Vrms
* Channel Gain: 11.98dB (3.97 times)
* Residual Noise: 3.2µV
* Signal-to-Noise Ratio (SNR): 131.4dB
* Dynamic Range: 131.8dB
* Channel Crosstalk: -102dB
* Total Harmonic Distortion (THD): 0.000075%
* THD + Noise (THD+N): 0.00022%
* Intermodulation Distortion (IMD): -110dB (0.000316%)
* Frequency Response Bandwidth: ±0.038dB (20-20kHz, completely flat)

Package Included:
* 1 x Preamp

Packaging Details:
* Weight: 3.5kg