|Kensonic Accuphase P-300
|195,000 yen(August, 1973 release)
Power amplifier of No. 1 which the Accuphase announced to the Kensonic age.
It was developed aiming at the amplifier which can be surely followed also
to a musical delicate change and mighty amplitude.
It has composition of
a whole page direct connection push pull from the input to the output.
this reason, the nakedness characteristic before applying NFB (negative return)
It uses the Oide power power transistor each six channels
at a time for an output stage, and this is made into the triple push pull.
The direct connection system of pure complimentary is used for a circuit
The mass filter capacitor of 40,000 micro Fx2 is adopted as a
The part is tested, selected carefully and adopted
from change of sound quality, and a durable field.
If a cord
short-circuits henceforth [ output terminal ], abnormalities occur to a speaker
or abnormalities arise by P-300 core, the protection circuit intercepted by
relay will be adopted.
At the time of an abrupt increase, the lamp of a
power meter blinks and abnormalities are told.
In order to cut noise
ingredients which happen by the run bull of a phone motor, or super-low-pass arm
resonance, such as an unnecessary input and an unnecessary input of super-upper
register, the band pass filter which removes 17Hz or less 24kHz or more by 18
dB/oct is built in.
The large-sized power meter is adopted, and it can
change and display in a 0dB -10dB-20dB range.
8-ohm load and 150W are set up as 0dB.
The speaker selector switch which has a
four-set stereo speaker switched is carried. Moreover, a two-line change of an
input is possible.
One circuit of an output terminal and one circuit of an
input terminal are established in the core of a front sub panel.
||Stereo power amplifier
(Both channel drive, 20Hz - 20kHz, 0.1% of distortion)
|4ohm load: 200 W/ch
8ohm load: 150 W/ch
16ohm load: 75 W/ch
|THD (20Hz - 20kHz)
||At the time of an Output power: 0.1% or less
- At the time of a 3dB output : 0.05% or less
At the time of a 50mW
output: 0.1% or less
||0.1% or less (at the time of an Output
|Frequency response (8-ohm load)
||20Hz-20000Hz+0 -0.2 dB
||20 (for 8-ohm load and 20Hz - 20kHz) or more
|A rated input / input impedance
|S/N ratio (at the time of an Output power)
||100dB or more
||Low Output-load-impedance type
|Audio band pass filter
||17Hz or less, 24kHz or more, 18 dB/oct
||Full power, 1/2, 1/4, a switch change
|The semiconductor used
||Transistor: 73 pieces
Diode: 88 pieces
Thermo sensitive register: Two pieces
IC: One piece
||100, 117, 220, 240V / 50-60Hz
||At the time of no inputting: 100W
time of an 8ohm load Output power: 510W
||Width 445x height 152x depth of 355mm