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The Accuphase C-3900S is the latest flagship precision stereo preamplifier, succeeding the C-3900 introduced in 2020 and replacing it as of October 2025. It represents over 50 years of Accuphase preamplifier development, incorporating advanced Dual Balanced AAVA volume control with ANCC (Accuphase Noise and Distortion Cancelling Circuit) for 30% lower noise than predecessors, high-gain discrete current feedback input amplification, ultra-low noise output with eight parallel summing amplifiers per channel, and a refined headphone amplifier with parallel push-pull output. The dual-mono power supply uses separate toroidal transformers and 12 x 10,000 µF filter capacitors for each channel. Mechanical enhancements include a precision-machined aluminum volume sensor with DC motor drive for smooth, silent operation and 115-step L/R balance adjustment. It offers extensive connectivity with 4 balanced and 7 line inputs, 2 balanced and 2 line outputs, plus recorder and external preamp inputs. The chassis features a champagne-colored front panel, solid wood cabinet, and cast iron feet for vibration isolation.
Analog signal output specifications
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
Estimated price (community-sourced)
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The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The C600's signal-to-noise is 120 dB against the C-3900S's 113 dB, its thd 0.002% against 0.005%, its output voltage 1.5V RMS against 2.0V RMS, and its input sensitivity 1.0V RMS against 0.3V RMS.
The Grandioso C1X's signal-to-noise is 120 dB against the C-3900S's 113 dB, its thd 0.000% against 0.005%, and its output impedance 30Ω against 50Ω. Both share output voltage (2.0V RMS).
The LINEb's signal-to-noise is 120 dB against the C-3900S's 113 dB, its thd 0.003% against 0.005%, its output impedance 90Ω against 50Ω, and its output voltage 1.6V RMS against 2.0V RMS.
The L1's signal-to-noise is 130 dB against the C-3900S's 113 dB, its thd 0.001% against 0.005%, its output impedance 30Ω against 50Ω, and its output voltage 8.0V RMS against 2.0V RMS.
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