Accuphase A-45 (2006)
Pure class A stereo power amplifier released in November 2006, with fully balanced signal paths and MCS+ topology.
Overview
The Accuphase A-45 is a pure class A stereo power amplifier. It was built with design technology from the A-60 and A-30, and it sits between them in the lineup. It was released in November 2006 and made in Japan under the NICOLOGY standard. The signal path is fully balanced from input to output stage. Each channel uses power MOS-FET devices in a six-parallel push-pull configuration, and the amp can be bridge-connected for monaural operation. It has 4-stage gain control and an analog power meter with OFF and sensitivity switching.
Specifications
| Amplifier Class | A (NICOLOGY) |
| Rated Output (Stereo, 8 Ω) | 45W + 45W |
| Rated Output (Monaural, 8 Ω, bridge) | 180W |
| Total Harmonic Distortion (Stereo, 4–16 Ω) | 0.03% |
| Frequency Response (rated output) | 20 Hz – 20 kHz ±0.2 dB |
| Gain | 28.0 dB (max) |
| Input Sensitivity (8 Ω, stereo, max gain) | 0.76 V |
| Input Impedance (Balanced) | 40 kΩ |
| Input Impedance (Unbalanced) | 20 kΩ |
| S/N Ratio (A-weighted, max gain) | 115 dB |
| Damping Factor | 200 |
| Power Consumption (no signal) | 235 W |
| Dimensions (W×H×D) | 465 × 211 × 464 mm |
| Weight | 30.9 kg |
| Power Supply | 100 VAC, 50/60 Hz |
Design
The A-45 is a fully balanced instrumentation amplifier design with MCS+ and current feedback circuits. Parallel operation extends to the A-class drive stage. The PCBs use gold-plated copper foil. Each channel has six parallel push-pull power MOS-FETs. The power supply has a 600 VA toroidal transformer and 47,000 μF×2 smoothing capacitors. A mode selector switch gives you stereo, dual mono and bridge modes. Inputs are balanced XLR and unbalanced RCA. The speaker terminals take Y lugs or banana plugs.
Context
The A-45 sits between the A-60 and A-30 in the Accuphase lineup. It offers 50% more power than the A-30 and costs half as much as the A-60. It has the brand's champagne/gold faceplate and dual analog power meters.
Market
The original price was ¥570,000. Used units have listed at $4,200 USD, €4,900 and NT$120,000. Original documentation has sold for up to €8, and catalog listings have received bids up to ¥1,100.
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ ACCUPHASE A-45 Nov 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $4,938 Latest $3,810 │ │ Median $3,810 Trend — │ │ Low $3,700 Volume ~2/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $5,000 ┤ │ │ │. │ │ │ │ │ $4,143 ┤ │ │ │ │ │ │ . .│ │ │ │ │ $3,000 ┤ │ │ ├─────────────────────────────────────────────────────────────────│ │ vol │█ █ █│ │ └─────────────────────────────────────────────────────────────────│ │ 2026-06 2026-06 2026-07│ └──────────────────────────────────────────────────────────────────────────┘
eBay completed sales. Excludes accessories, parts, and non-working units. Hover points for details.
eBay Listings
Recently sold on eBay: $3,700–$4,938 (median $3,810, based on 3 completed sales, past 12 months)
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