Accuphase P-300L (1984)

Name: Accuphase P-300L
Brand: Accuphase

High-power stereo amplifier with balanced inputs and bridgeable mono operation, released in June 1984.

Overview

The Accuphase P-300L is a stereo power amplifier released in June 1984. It is the fourth generation of the P-300 series and is based on the P-300X. It puts out 250W per channel into 4Ω, with total harmonic distortion of just 0.01% across all stereo loads. It is built for stability and drives loads down to 2Ω. It uses a non-switching distortion design, a DC servo system and direct signal input coupling.

Specifications

Power Output (20Hz–20kHz, 0.01% THD)	Stereo: 300W/ch (2Ω), 250W/ch (4Ω), 170W/ch (8Ω), 85W/ch (16Ω); Monaural (bridge): 600W (4Ω), 500W (8Ω), 340W (16Ω)
Total Harmonic Distortion	0.01% (stereo, 2–16Ω); 0.01% (monaural, 4–16Ω)
IM Distortion (EIA)	0.003%
Frequency Response	20Hz–20kHz (+0/-0.2dB); 0.5Hz–250kHz (+0/-3dB at 1W)
Damping Factor (EIA 50Hz)	300 (stereo); 150 (monaural)
Input Sensitivity (8Ω)	Stereo: 1.5V (rated output); Monaural: 2.5V (rated output)
Input Impedance	20kΩ unbalanced; 600Ω balanced
S/N Ratio	120dB (shorted input); 100dB (1kΩ source, 1W output)
Gain	28.0 dB (both stereo and monaural)
Power Consumption	560W (at 8Ω rated output)
Dimensions	445mm (W) × 160mm (H, with legs) × 373mm (D)
Weight	23.0 kg
Power Supply	AC100V/117V/220V/240V, 50Hz/60Hz
Inputs	RCA and XLR

Design

The input stage is direct-coupled, with a cascode bootstrap push-pull input circuit and DC servo control. The pre-drive stage runs in Class A using cascode push-pull topology. The driver stage uses Power MOS FETs, also in a cascode push-pull configuration. The output stage is 5-parallel, with ten 100W transistors, for an equivalent collector loss capacity of 1000W. A large aluminum heat sink keeps it thermally stable. Other features are a non-switching distortion design, balanced 600Ω XLR inputs, a subsonic filter (10Hz, -18dB/oct), logarithmic peak-hold output meters, and front-panel I/O on a sub-panel. It supports bridge-mono operation and is compatible with 2Ω loads.

Market

The P-300L originally sold for ¥330,000. A matching rosewood cabinet (Model A-8) was sold separately for ¥16,000. Recent eBay listings show pre-owned units between $1,450 and $2,150, with some serviced units reaching $1,800. A used P-300L paired with a C-200L preamp was listed for €2,600 on Kleinanzeigen in January 2026.