Description
Experience the legendary sound of the classic Marantz M7 circuit with this universal audiophile-grade preamplifier board. The M7 circuit is renowned for its rich tube flavor and a sound signature characterized by a sweet, natural midrange that is incredibly non-fatiguing. It performs exceptionally well with vocals, classical, and folk music, producing an expansive and open soundstage with beautiful harmonics and a strong sense of air.
PRODUCT INFORMATION
Circuit Design: Marantz M7
Supported Tubes: 6N3, 6H3N, GE5670, 2C51, 6CC42, etc.
Supported Rectifier Tubes: 6Z4, CV394, U2M70, 6202, etc.
Magnification: Approx. 5x
PCB Dimensions: 160mm x 85mm x 1.6mm
Max Component Height: Tallest Tube: 67mm; Tallest Capacitor: 43.5mm
Power Supply Requirements (Transformer NOT Included)
High Voltage (B+): Requires a transformer with one 150V to 250V AC secondary winding.
Low Voltage (Filament): Requires a transformer with two separate 6V to 6.3V AC secondary windings.
Brief Introduction & Component Highlights
This preamplifier board is built with no compromises, using carefully selected audiophile components to continue the M7's legacy. The circuit features imported German WIMA coupling capacitors and Japanese Nippon Chemi-Con KXG long-life, high-frequency, low-impedance capacitors. The layout has been meticulously optimized to ensure a clean signal path and outstanding performance, delivering a sound quality that is far beyond its price point.
Package Includes
1 x Assembled Marantz M7 (N3 Version) Tube Preamplifier Board
(This is a finished board and does not require assembly. Tubes, transformer, chassis, and any other accessories are not included unless specified in a package option.)
Important Notes & Disclaimers
CRITICAL WARNING: The high-voltage input MUST be powered by an isolation transformer. DO NOT connect it directly to mains electricity.
Usage Limitations: This product is a preamplifier. It cannot drive headphones or passive speakers directly and must be connected to a power amplifier or active speakers. It cannot be used in a car.
DIY Skill Required: While this board is assembled, integrating it into a system requires electronic knowledge. Please do not wire it haphazardly if you are inexperienced. Wiring mistakes can cause irreversible damage. If you are uncertain, please send a clear photo of your connections to our customer service before powering on.
Power Supply Requirements (Transformer Not Included)
This version of the Marantz M7 board is specifically designed for the 6N3 tube family and its equivalents (such as 6H3N, GE5670, 2C51, 6CC42, etc.). To power these tubes correctly, you will need a single power transformer with the following three separate secondary windings:
1x High-Voltage Winding:
Voltage: Between 150V and 250V AC.
Purpose: This powers the tube's main high-voltage (B+) circuit.
2x Low-Voltage Windings:
Voltage: You need TWO (2) separate windings, each providing between 6V and 6.3V AC.
Purpose: These independent windings are required to power the 6.3V filaments of the compatible tubes.
