Accuphase C-275V (2000)

The C-275V weighs 21.7kg. It sits heavy on the rack, and it was built for silence, speed and precision.

Overview

The Accuphase C-275V is not a tube-era relic or a minimalist audiophile statement. It is a stereo control amplifier from Accuphase Laboratory, Inc., released in May 2000 with a launch price of ¥530,000. It sat at the high end of the company's line and used technology trickled down from the flagship C-290V. It is built for people who want transparency, low noise and modular construction, with a fully balanced design and parts choices that favor isolation and signal purity over cost or convenience.

Owners report it delivers on that. The C-275V runs in line-only mode by default. Turntables need the optional AD-275V phono equalizer unit, which keeps the signal path clean for line sources and lets vinyl users add phono later. The 21.7kg mass comes from the internals: separate left and right power transformers, thick aluminum housings for the individual amplifier stages, and printed circuit boards on Teflon substrates, chosen for stable dielectric properties and minimal signal loss at high frequencies. All of it is aimed at minimizing crosstalk and preserving transient response.

Despite the 2000 release date, the C-275V is resolutely analog. It has discrete circuitry throughout and no digital inputs or processing. Logic-controlled relays manage the signal path. They are industrial-grade, closed-type units with gold-plated crossbar twin contacts, and they keep the route between input and output as short as possible. They were selected for consistent contact resistance and low noise, which matters in a preamp where microvolts count. The front panel has an output phase switch, a subsonic filter at 25 Hz with a -12dB/octave slope, and a three-position compensator for tonal shaping when volume is reduced.

Specifications

Key Features

Current Feedback Circuit Topology

The C-275V uses a current feedback design, a hallmark of Accuphase's high-end approach. Voltage feedback amplifiers dominate the market, but current feedback circuits offer wider bandwidth and faster transient response, which helps preserve the leading edges of instruments and the spatial cues in complex recordings. This contributes to the extended frequency response, which reaches 300 kHz at the upper limit. Ultrasonic performance isn't audible content, but it ensures phase linearity and stability well within the audible band, reducing group delay and preserving timing accuracy. Collectors note that this topology, while less common, keeps distortion low across a wide dynamic range.

Balanced Output Stage with Bridged Feedback

The output stage is fully balanced and uses a bridged feedback configuration, which cancels even-order harmonic distortion and improves common-mode noise rejection. That is more than a convenience for XLR users. It is part of the signal integrity strategy. With balance maintained throughout the signal path and bridged feedback, the C-275V reaches a remarkably low noise floor, especially with balanced power amplifiers. The minimum load impedance is rated at 600 ohms, a conservative figure that keeps things stable with long cable runs or less-than-ideal downstream components.

Pure Complimentary Service Push-Pull Circuit (Discrete Parts)

The line amplifier section is a pure complimentary push-pull circuit built entirely from discrete transistors. There are no op-amps and no integrated circuits. That allows tighter control over component matching and thermal behavior, giving symmetrical performance between positive and negative signal swings. Discrete parts also let Accuphase tune each stage for goals like slew rate and open-loop bandwidth without being limited by off-the-shelf ICs. It is labor-intensive, but owners report it pays off in dynamic clarity and low intermodulation distortion.

Teflon-Based Printed Circuit Boards

Teflon (PTFE) as a printed circuit board substrate is a high-cost, high-performance choice. It has one of the lowest dielectric constants among PCB materials, which reduces signal loss and capacitance between traces. It is also stable across temperature and humidity changes, so performance stays consistent over time. It is fragile and difficult to manufacture with, but Teflon boards are a favorite in high-frequency and precision analog work. In the C-275V they support the wide bandwidth and low phase shift, particularly in the ultrasonic range.

Complete Mono Construction with Separate Transformers

The C-275V has complete mono construction, with separate power transformers for the left and right channels. That removes power supply crosstalk, a subtle but real issue in stereo components that share one transformer. Each channel runs from its own isolated power source, which contributes to a wider, more stable soundstage. The transformers sit in thick aluminum enclosures that shield them from electromagnetic interference. This level of isolation is rare even in modern high-end gear.

Fully Modular Construction with Separate Amplifier Stage Units

Every amplifier stage in the C-275V is a separate module, physically isolated in its own thick aluminum housing. This isn't only for serviceability. It also prevents thermal and electromagnetic coupling between stages. Each module can be tested, tuned and replaced individually, which technicians and long-term owners appreciate. The layout also allows precise grounding schemes, minimizing ground loops and hum. It raises manufacturing cost and complexity, and it gives a cleaner, more controlled signal path.

Logic-Controlled Relays with Gold-Plated Crossbar Contacts

Signal routing is handled by industrial-grade, closed-type relays designed for the communications industry. They are not standard automotive or consumer relays. They are built for high reliability and low contact resistance. The gold-plated crossbar twin contacts give consistent conductivity and resist oxidation over time. Logic control means the relays are switched by low-level signals, so high-current switching noise stays out of the audio path. The switching is near-instantaneous and wear-resistant, and it maintains signal integrity across thousands of operations.

Three-Position Compensator for Volume-Dependent Tone Shaping

The compensator is for listening at low volume. When volume is reduced, human hearing loses sensitivity to bass and treble (the Fletcher-Munson effect). The C-275V offers three selectable curves: +3dB at 100Hz, +6dB at 100Hz, or +6dB at both 100Hz and 20kHz. This keeps tonal balance at lower listening levels without tone controls that can degrade sound quality. It is a subtle tool, useful in smaller rooms or late-night sessions.

Subsonic Filter at 25 Hz, -12dB/Octave

The subsonic filter matters for vinyl playback, especially with the AD-275V phono unit added. It rolls off frequencies below 25 Hz at -12dB per octave, removing rumble, turntable noise and port resonance from bass reflex speakers without affecting the audible bass. The slope is steep enough to work and gentle enough to avoid phase distortion in the low bass. It also keeps downstream amplifiers and speakers from wasting power on inaudible frequencies.

Integrated Headphone Amplifier Circuit

Despite being a line preamp, the C-275V has a built-in headphone amplifier designed for high fidelity. It is a dedicated circuit meant to preserve the preamp's sonic character when driving headphones directly. Accuphase evidently expected use in both high-end stereo systems and private listening.

Remote Commander RC-26 for Volume and Input Control

The included RC-26 remote controls volume and input selection without touching the analog signal path. It talks to the unit by infrared, and all switching is still handled by relays. There are no digital potentiometers or stepped attenuators that could degrade sound, so the volume control keeps its integrity.

Optional AD-275V Phono Equalizer Unit

The C-275V is line-only by design, but the AD-275V phono equalizer unit upgrades it with both MM and MC inputs, with switchable impedance and gain. The AD-275V is not compatible with other models except the C-275 and C-275V. When attached, it extends the preamp's depth by 9mm and adds 0.8kg to the total weight. The modular phono stage isolates the sensitive RIAA equalization circuitry from the main unit, minimizing noise and crosstalk.

Collectibility & Value

The C-275V was sold with the Remote Commander RC-26, and the AD-275V phono equalizer unit was available separately for ¥100,000. Current market prices vary significantly with condition, accessories and region. Listings show a wide range: approximately $1,500 for a standalone unit (Raw Research), up to $9,000 when paired with a P-1000 power amplifier, and prices in Poland ranging from PLN 13,500 to 28,900 (OLX Poland). There is no standardized market for this model, and prices depend heavily on completeness and local demand. Units with the AD-275V and original packaging likely command premiums, especially where Accuphase has a strong following.

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Service Manuals, Schematics & Catalogs

• Catalog (1991) — archive.org
• Catalog (1992) — archive.org
• Catalog (1990) — archive.org

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