Akai AM-2950 Service Manual

PRELIMINARY SERVICE MANUAL
mopeL AM-2850/2950
DATE January, 1979
I. TECHNICAL DATA
1. Model AM-2850
POWER AMPLIFIER SECTION
Rated Output Power
2-Channels Driven
Frequency Response
Power Bandwidth (IHF)
Signal to Noise Ratio (IHF)
PHONO
AUX
Residual Noise
Channel Separation (IHF)
PHONO
Damping Factor
Output Speakers
Headphone
PRE AMPLIFIER SECTION
Input Sentivity/Impedance
PHONO
AUX
TUNER
TAPE MONITOR
MAIN IN
Output Level/Impedance
TAPE REC
PRE OUTPUT
Frequency Response
PHONO (RIAA equalization)
AUX, TAPE MONITOR
Tone Control
BASS
MID RANGE
TREBLE
Loudness Control
Filter HIGH
LOW
95 watts per channel, minimum RMS, at 4 ohms
from 20 to 20,000 Hz with no more than 0.08%
total harmonic distortion.
85 watts per channel, minimum RMS, at 8 ohms
from 20 to 20,000 Hz with no more than 0.08%
total harmonic distortion.
2 xX 140 watts into 8 ohms at 1 kHz, with no
more than 0.08% total harmonic distortion.
2 x 100 watts into 8 ohms at 1 kHz, with no
more than 0.08% total harmonic distortion.
Main in: DC to 100kHz +0dB, -0.5dB
10 Hz to 40 kHz/8 ohms
(Total Harmonic Distortion: 0.08%)
Better than 75 dB
Better than 95 dB
Less than 0.3 mV at 8 ohms
Better than 50 dB at 1kHz
More than 50 (1 kHz, 8 ohms)
A, B, C (4 to 16 ohms)/A+B, A+C, B+C (8 to 16 ohms)
4 to 16 ohms
PHONO 1: 3mV/33/47/100 kohms,
PHONO 2: 3mV/47 kohms
150 mV/100 kohms
150 mV/100 kohms
PIN: 150 mV/100 kohms,
DIN: 30 mV/100 kohms
PIN: 1V/47 kohms
PIN: 150 mV/1 kohms,
DIN: 150 mV/30 kohms
1V/47 kohms
30 Hz to 15 kHz +0 dB, -1 dB
3 Hz to 60 kHz +0 dB, -1 dB
+9 dB at 100 Hz
+10 dB at 1 kHz
+9 dB at 10 kHz
+10 dB at 100 Hz, +6 dB at 10 kHz
(Volume control set at -30 dB position)
-6 dB at 10 kHz
-6 dB at 30 Hz
AKAI ELECTRIC CoO., LTD.
(P.0.BOX 21, Tokyo Airport, Japan)
12-14, 2-chome, Higashi-Kojiya, Ohta-ku, Tokyo, Japan
Printed in Japan

Akai AM-2950 Specifications

General

Brand	Akai
Model	AM-2950
Category	Amplifier
Language	English

Summary

Technical Data

AM-2850 Power Amplifier Specifications

Detailed specifications for the AM-2850 power amplifier section, including output power and frequency response.

AM-2850 Preamplifier Specifications

Detailed specifications for the AM-2850 preamplifier section, including input sensitivity and tone control ranges.

AM-2950 Power Amplifier Specifications

Detailed specifications for the AM-2950 power amplifier section, including output power and frequency response.

AM-2950 Preamplifier Specifications

Detailed specifications for the AM-2950 preamplifier section, including input sensitivity and tone control ranges.

Principal Parts Location

AM-2850 Front Panel Parts

Diagram identifying components and controls on the front panel of the AM-2850 model.

AM-2850 Top View Parts

Diagram identifying internal components and boards on the top view of the AM-2850 model.

AM-2950 Front Panel Parts

Diagram identifying components and controls on the front panel of the AM-2950 model.

AM-2950 Top View Parts

Diagram identifying internal components and boards on the top view of the AM-2950 model.

Amplifier Adjustment Procedures

Adjusting the Idling Current

Procedure for adjusting the idling current for both AM-2850 and AM-2950 models.

Adjusting the DC Balance

Procedure for adjusting the DC balance on the amplifier's left and right channels.

Adjusting the Level Meter Indication

Procedure for setting up and adjusting the power level meters on the AM-2850 and AM-2950.