Accuphase E-302
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Audio Database

The

Accuphase E-302/E-302B 
220,000yen (December, 1984 release)

Description

Integrated amplifier which aimed at correspondence to digital sauce based on the development technology and the element which have been cultivated with high-class separate amplifier for years. There were two kinds such as E-302 of the champagne gold-collar and E-302of black calla B.

In the output stage of a power amplifier part, it has parallel push pull composition with four transistors of Pc(collector loss)120W, and the MOS FET drive stage is adopted as the preceding paragraph which drives this. MOS FET is the optimal element for this stage in which a low Output load impedance and high drive voltage are demanded, and has obtained the output with high quality without notching distortion conjointly with low emitter resistance-ization of the output stage.
Moreover, the input stage of power amplifier constitutes the bootstrap dregs cord differential amplifier of FET and a transistor, and has acquired the outstanding high region characteristic and stability.
The power amplifier part of E-302 serves as a design corresponding to low impedance load, and Pc of the output stage considered it as the large electric power composition which is about 500W, and also it has adopted the large-sized transformer of 700VA.

All the unit amplifier of each stage serves as a direct connection system from the Disc input.
The problem of direct-current drift generated by direct connection stabilized each unit amplifier by direct-current servo, and is solved.

One amplifier system which changes the gain of high gain equalizer amplifier based on the required gain of MM and MC is used for an equalizer amplifier part.
By this system, although it is stable operation to change of the amount of NFB, and a cure against a remains noise at the time of MC cartridge use, to stability, bootstrap dregs cord differential amplifier was adopted as the input with FET and a transistor, and the characteristic of a high region is improved. And the magnification circuit in which an operational amplifier and whose final stage are adopting simple composition called the complimentary push pull, and the next stage was stabilized is realized. moreover -- as opposed to S/N at the time of MC input -- FET of an input -- three -- the remains noise is reduced by making it parallel.
At the time of MC input, while it becomes a high gain equalizer of 60dB of a 30dB rise to gain 30dB at the time of MM input and can respond to all types of MC cartridge, it is the three-stage change of input impedance,It is possible to choose the optimal load impedance of a cartridge.

In order to prevent inducing degradation of a high region, and an unstable component by taking about a signal course for an input change, the relay has been arranged in the middle of a signal course, and the logic relay control which combines a signal course at the shortest is adopted by controlling this relay in a logic circuit.
By having adopted especially as a relay the relay of a crossbar twin system to which the golden layer was made to form in the silver palladium alloy developed as an object for small signal audios, and also sealing, the open air is intercepted and durability is raised.

The switch and input-and-output terminal which carry out the separation of a preamplifier output and the power amplifier input are carried.

The loudness Compensation is carried, Hearing impression at the time of small volume is rectified automatically, and energy balance is prepared.
The Hearing impression curve can choose three kinds of characteristics according to the acoustic feature of the room, a speaker, and liking.

The power meter of logarithm compression type peak directions is carried.
The lighting of the meter scale is the indirect illumination glared from the upper part.

The function of a Subsonic Filter, an Attenuator, a mode switch, etc., etc. is carried.

There was a wood cabinet as an option.

The
Rear
Internal
A

Rating of a mode
Form Integrated stereo amplifier
Continuation average output
(EIA, both channel operation)
20Hz - 20kHz, 0.02% or less of a distortion
180W+180W (4ohms)
120W+120W (8ohms)
60W+60W (16ohms)
THD (EIA, both ch(es) operation)
0.25W - an Output power, 20Hz - 20kHz
0.02% (4ohms)
0.01% (8ohms)
0.01% (16ohms)
IM distortion (EIA) 0.01%
Frequency response (EIA)
Main amp input: 20Hz-20kHz+0 -0.2dB (at the time of an Output power)
0.5Hz-200kHz+0 -3.0dB (at the time of 1W output)
High Level input: 20Hz-20kHz+0 -0.2dB (at the time of an Output power)
Low Level input: 20Hz-20kHz+0.2 -0.5dB (at the time of an Output power)
Dumping factor (EIA) 120 (8 ohms, 50Hz)
Input sensitivity/impedance
(An Output power / EIA1W output)
Disc MM: 2.5mV/0.22mV/47kohm
Disc MC: 0.08mV/0.007mV/10, 30, 100ohm
High Level input: 76mV/7.1mV/40kohm
Main amp input: 1.23V/113mV/20kohm
The Disc maximum input
(1kHz, 0.005% of distortion, Rec out)
MM:300mVrms
MC:9.5mVrms
An Output power/impedance Pre output: 1.23V/200 ohm
Tape rec output: 76mV/200 ohms (at the time of a Disc input)
Headphones: 0.4V, conformity impedance: 4ohms - 32ohms
Gain Main input -> Output: 28dB
High Level input -> Pre output: 24dB
Disc MM -> Tape rec output: 30dB
Disc MC -> Tape rec output: 60dB
S/N, input conversion noise
Input short-circuit and A-compensation New IHF
At the time of a rated input Input conversion noise
Main amp input: 122dB -120dBV 102dB
High Level input: 104dB -121dBV 82dB
Disc MM: 86dB -139dBV 80dB
Disc MC: 66dB -149dBV 75dB
Loudness Compensation Comp 1:+3dB(100Hz)
Comp 2:+6dB(100Hz)
Comp of 3:+8dB (100Hz), +6dB (20kHz)
Subsonic Filter 17Hz, -12 dB/oct
Attenuator -20dB
Power meter Logarithm compression type peak level display
dB and the output Direct reading at the time of 8-ohm load
Load impedance 2ohm-16ohm
The semiconductor used Transistor: 86 pieces
FET: 24 pieces
IC: 14 pieces
Diode: 86 pieces
Power source AC100V/117V/220V/240V, 50Hz/60Hz
Power consumption 55W (at the time of no inputting)
280W (Electrical Appliance and Material Control Law)
450W (at the time of an 8-ohm load Output power)
Dimensions the width 445x height 145(piece -- it includeds) x depth of 370mm
Wood cabinet: Width 466x height 170x depth of 380mm
Weight 16.2kg
Option Wood cabinet A-16 (16,000yen)


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