OldChen C1 HI-end 6H8C/CV181-SE Vacuum Tube Pre-Amplifier Bass Adjustment Preamp, Audiophile 5U4C Rectifier Preamp with Dual VU Meters, Ultra-Low Noise (Black, Upgrade)

1. Has the direct amplification function of a standard tube preamp, but also adds moderate treble and bass controls. You can adjust the tone according to preference, making musical details clearer and more listenable at low volumes. Whether paired with a tube amp or a solid-state amp, it can polish the sound and also enhance high-frequency resolution, low-frequency power, and the overall dynamic range.
2. Extremely low noise is basically negligible. 0.08mV at low volume, 0.7mV at high volume. Signal-to-noise ratio is as high as 96db,
3. Distortion is around 0.15%, the frequency response curve is flat, and all indicators are based on actual measurements.
4. External high-margin EL pure copper transformer, 10H choke, CLC filter, tube rectification linear voltage regulation, two-stage direct-coupled cathode output circuit, all Rubycon electrolytic capacitors, Rel-cap fever coupling capacitors, WIMA tone capacitors, high-precision metal film resistors, 5 pure copper gold-plated stainless steel ceramic tube sockets, Omron relays responsible for the 4-way input and treble/bass intervention switching. The rational matching of components and layout allow the machine's appearance and performance to reach an ideal state.
5. The rectifier tube uses a new-old-stock direct-heat rectifier tube 5U4C. The standard configuration is matched with 4 Russian imported 6H8C tubes. The high-end configuration is matched with 4 Psvane "Big-Bottle" CV181-SE tubes.
6. The whole machine uses a standard 43cm large chassis, with a grand and stable dual VU meter design. The external tubes are convenient for tube rolling, increasing playability. Net weight is 12 kg, packaged weight is 14 kg.

We offer four configurations based on two key choices. Please select the combination that best fits your system:

Choice 1: Select Your Sound (Tubes)

• Standard Version: Equipped with four (4) Soviet 6H8C (6SN7) tubes. This provides the classic, warm, and rich tube sound.
• Upgrade Version: Equipped with four (4) premium Psvane CV181-SE tubes. This offers a significant sonic improvement with greater detail, a wider soundstage, and a more refined performance.

Choice 2: Select Your Connectivity (Ports)

• Standard (RCA Only): Comes with 4 sets of RCA inputs and 2 sets of RCA outputs. Perfect for most home Hi-Fi systems.
• Balanced (RCA + XLR): Adds true XLR Balanced Inputs and Outputs to the standard RCA ports. This is ideal for connecting to high-end power amplifiers or DACs that use balanced connections, offering superior noise rejection.