Audio Database


Accuphase P-102
235,000 yen(January, 1987 release)


Class-A stereo power amplifier which adopted the whole page push pull full balance system.

Balance transmission is applied to the whole system from an input to an output, and high quality power transmission is enabled.
By a balance transmission system, since distortion generated with amplifier is also canceled at the same time it carries a transmission system for exclusive use in a plus signal and each minus signal and cancels external noise theoretically, a pure signal ingredient can be taken out.

The Class-A drive system is adopted and Class-A operation of an input stage and the output stage is carried out.
In the output stage, the transistor for high bandwidth electric power magnification of collector loss Pc=80W was constituted from a parallel push pull, Pc of the unit amplifier of one side was set to a total of 320W, and the generous output stage is realized.
Moreover, it is considered as the output stage which can also fully bear low impedance load by giving a margin, and the ideal drive is aimed at by adopting as a predrive stage the power MOS FET drive which is an original system of an Accuphase.

The Class-A cascode differential push pull is adopted as an input stage.
Operation is stable over [ for the circuit where a cascode circuit is used as an object for high frequency magnification reason ] a large frequency band, the linearity of an input is good and the large dynamic range is secured.

The power-source part made right and left become independent completely, and has adopted twin mono-composition with two sets of perfect monophonic amplifier.
This has eliminated the mutual intervention on either side.

The direct connection system is adopted as an input.
When the large preamplifier of direct-current drift etc. is connected, in order to prevent it amplifying and giving a damage to a speaker, direct-current servo system of Accuphase original is adopted, and while omitting a direct current, direct-current drift of the amplifier by a temperature change itself is also stabilized.

The balance input and the imbalanced input are carried in the input.

Analog type large-sized meter is carried and an output meter directs a peak value in the guide type meter which can carry out the Direct reading of dB and the output watt. The Direct reading of the large power range can be carried out for logarithm compression.
Moreover, the switch with which an operation and proof of meter are cut is also built in.

It is the design which attached the sideboard of the natural persimmon to panel finishing of a gold tone scratch hair line.


Rating of a mode
Form Stereo power amplifier
Output power (both channel operation)
20Hz - 20kHz, 0.02% of a distortion
2ohm load: 70 W/ch
4ohm load: 80 W/ch
8ohm load: 50 W/ch
16ohm load: 25 W/ch
(20Hz - 20kHz, both channel operation)
2-4ohm load: 0.02%
8-16ohm load: 0.01%
IM distortion 0.003%
Frequency response
At the time of a continuation average output Volume maximum: 20Hz-20kHz+0 -0.2 dB
At the time of 1W output Volume maximum: 0.5Hz-200kHz+0 -3.0 dB
Volume 6dB: 0.5Hz-80kHz+0 -3.0 dB
Profit 28.0dB
Load impedance 2ohm-16ohm
Dumping factor 70
Input sensitivity (8-ohm load) At the time of a continuation average output: 0.8V
At the time of 1W output: 0.11V
Input impedance Balance: 40kohm
Disequilibrium: 20kohm
S/N ratio (A-compensation)
At the time of input short-circuit and a continuation average output Balanced input: 120dB
Unbalanced input: 112dB
At the time of input 1kohm and 1W output Balanced input: 100db
Unbalanced input: 96dB
Power output meter A logarithm compression type, -40dB-+3dB, and an output Direct-reading scale
The semiconductor used Transistor: 81 pieces
FET: 16 pieces
IC: Eight pieces
Diode: 89 pieces
Power source 100V/117V/220V/240V, 50Hz/60Hz
Power consumption At the time of no inputting: 245W
Electrical Appliance and Material Control Law: 255W
At the time of an 8ohm load Output power: 300W
Dimensions Width 475x height 170x depth of 408mm
Weight 22kg