Audio Database


Accuphase M-60
290,000 yen(one set, the July, 1975 release)


Monophonic power amplifier which allowed no compromise but was completed over long time aiming at improvement in much more quality of playback music.
By considering it as monophonic power amplifier, while suppressing the mutual intervention between right-and-left channels, weight and size are limited to the range which can be treated alone.

Based on the active device which was excellent in the high frequency characteristic, circuit composition constitutes all the magnification stages from a symmetrical type push pull, and has realized the outstanding standup characteristic, linearity, and stability by giving a little NFB.
thereby -- TIM -- also setting at the time of full power, while preventing distorted generating -- low -- the distorted output has been obtained.
Moreover, in order to realize sound quality with few colorations, the capacitor in a NFB loop is removed and it has direct-current amplifier composition.

Energy as big as 152J is gained by impressing the high voltage to a large-sized transformer and the filter capacitor of 22,000 micro Fx2 at a power-source part (P-300 type is 120J).
Thereby, the low-pass output characteristic is improved sharply.

The logarithm compression type which can carry out the continuation Direct reading of 300W from 3mW is adopted as a power output meter.
This meter can change both peak directions and volume directions with a switch.

The Subsonic Filter is carried in order to cut an unnecessary super-low-pass noise.

As volume control, adjustment of a 1dB step is possible to -20dB, and less than it carries 25 contact rotary switch of -23dB, -26dB, -30dB, and -infinity.

Also in consideration of a studio monitor or the use as an object for PA of a hole, it is considered as 19 type standard rack-mounted form, and the canon input is also prepared.

For the reason when setting to the place where the heat dissipation effect is very bad, or carrying out continuous use by the Oide power for a long period of time, the optional fan for airs cooling with blower can attach.

Internal 25

Rating of a mode
Form Monophonic power amplifier
Output power
(20Hz - 20kHz, 0.03% or less of distortion)
450W (4ohms)
300W (8ohms)
150W (16ohms)
THD (20Hz - 20kHz) 0.03% or less (at the time of an Output power)
0.01% or less (at the time of a -3dB output)
0.05% or less (at the time of a 50mW output)
IM distortion 0.01% or less (at the time of an Output power)
Frequency response (8-ohm load) 20Hz-20kHz+0 -0.2dB (at the time of an Output power)
2Hz-150kHz+0 -3.0dB (at the time of 1W output)
Dumping factor (8-ohm load) 120(40Hz)
Input sensitivity/impedance 2.0V/100kohm
S/N ratio (input short-circuit, IHF-A) 115dB (at the time of an Output power)
Subsonic Filter 17Hz, 18 dB/oct
Power output meter Logarithm compression type
- It is a continuation Direct reading to 50dB (3mW) - +3dB (600W).
A peak level, with a volume level changeover switch
The semiconductor used Transistor: 47 pieces
IC: Three pieces
Diode: 51 pieces
Power supply voltage AC100V/117V/220V/240V, 50Hz/60Hz
Power consumption At the time of no inputting: 65W
At the time of a 4ohm load Output power: 800W
At the time of an 8ohm load Output power: 540W
Dimensions Width 482x height 170x depth of 345mm
Weight 27kg
Option A set of accessories (with a fan) O-81 (8,000yen)
Remarks Standard rack (19 inches) attachment is possible.
Rack-mounted pitch: 100mm (4 inches)
Rack bore (horizontal): More than 430mm (16 15/16 inches)